CN107734552B

CN107734552B - Method and device for selecting random access carrier and electronic equipment

Info

Publication number: CN107734552B
Application number: CN201610872959.3A
Authority: CN
Inventors: 陆婷; 余媛芳; 戴博
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-08-11
Filing date: 2016-09-29
Publication date: 2022-06-03
Anticipated expiration: 2036-09-29
Also published as: CN107734552A

Abstract

The invention discloses a method and a device for selecting random access carriers and electronic equipment, wherein the method comprises the following steps: obtaining a time domain factor, wherein the time domain factor is one of the following: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal; selecting a carrier used for a random access process for the UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers; further comprising: acquiring random access information, wherein the random access information comprises a random access triggering condition and/or a sending stage of a random access preamble where a terminal is currently located; and constructing an available carrier set according to the random access information or the system configuration information, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers.

Description

Method and device for selecting random access carrier and electronic equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for selecting a random access carrier, and an electronic device.

Background

Machine Type Communication (MTC) is an important issue of current research in fifth generation mobile Communication technology (5G), and is also an important application field of future wireless Communication. In the MTC topic, a research sub-topic of narrowband Internet of Things (NB-IoT) is proposed for terminal characteristics such as low cost, low power consumption, low mobility, and low throughput, that is, a low throughput wireless communication service is provided for NB-IoT low-cost terminals (UEs) within a frequency band of 200 khz.

Considering that the single carrier cell capacity of 200khz spectrum bandwidth is small, and it is difficult to support the traffic transmission of a large number of NB-IoT terminals, a feasible solution is to deploy multiple carriers to cover the same area. However, if each carrier is independent of a cell, there are two problems: 1) a plurality of cells covered by the same coverage area exist, and too many cells bring unnecessary radio quality measurement overhead to UE; 2) if each carrier is a cell independently, each carrier needs to be configured with a broadcast channel and a synchronization channel, which is also a waste of carrier resources. Therefore, a multi-carrier cell strategy is introduced in the standard, that is, a plurality of single-carrier cells covering the same area under the same base station are converged into one multi-carrier cell. The concrete expression is as follows: a plurality of carriers (carriers) share one physical cell identity and transmit a broadcast channel and a synchronization channel only on one carrier, which is called an anchor carrier. Other carriers are used to provide uplink and downlink traffic channel transmissions and are referred to as non-anchor carriers.

However, the existing standards require that the terminal can only listen for pages on the anchor carrier and initiate random access. In some applications, there may be a scenario where a large number of terminals simultaneously listen to paging or simultaneously initiate random access, and at this time, the anchor carrier may also become a bottleneck, resulting in poor system performance due to its limited capacity.

Aiming at the problems, the terminal is allowed to use a non-anchor carrier of system configuration in the random access process to improve the random access capacity.

Further, if multiple carriers are available for the terminal to initiate random access, the terminal needs to select one carrier to initiate random access based on a reasonable scheme. In the prior art, there are various carrier selection schemes, including:

(1) randomized carrier selection based on a hash (hash) algorithm: and the terminal randomly selects the used carrier serial number in an available carrier set comprising a plurality of carriers based on a hash algorithm.

(2) Carrier selection based on terminal identification: the terminal determines the carrier Number used by taking the terminal Identification (such as International Mobile Subscriber Identity (IMSI)) modulo the total Number of carriers in the available carrier set.

(3) Selecting carriers based on the priority of the frequency points: the network assigns different priorities to each carrier, and the terminal preferentially selects the high-priority carrier in the available carrier set.

(4) Carrier selection based on probability selection factor: the network assigns probability selection factors to each carrier based on operator strategies or load conditions, and the terminal selects the corresponding carrier according to whether the generated random number falls into a probability selection interval.

In the above scheme, the scheme (1) is not adopted in the Long Term Evolution (LTE) standard because the terminal does not support it; in the scheme (2), if there are many terminals with terminal identifiers in a specific format in a certain area, it is possible that these terminals always select a same carrier, which may cause a problem of unbalanced carrier load; similarly, scheme (3) may also cause a high priority carrier overload problem; the scheme (4) is complicated in algorithm, and problems similar to the scheme (2) and the scheme (3) may also occur.

Disclosure of Invention

In order to solve the above technical problems, embodiments of the present invention provide a method and an apparatus for selecting a random access carrier, and an electronic device.

The method for selecting the random access carrier provided by the embodiment of the invention comprises the following steps:

obtaining a time domain factor, wherein the time domain factor is one of the following: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal;

and selecting a carrier used for a random access process for the UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers.

In this embodiment of the present invention, the selecting a carrier used for the random access process for the terminal UE in the available carrier set according to the time domain factor includes:

the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod Nt]mod N_carrierOr [ UE _ ID/Nt]mod N_carrier；

Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In the embodiment of the present invention, the time domain resource information factor of the terminal initiating the random access process is one or any combination of the following:

a PRACH period in a PRACH resource configuration;

a starting subframe position in a PRACH resource configuration;

a maximum number of attempts to transmit each preamble in a PRACH resource configuration;

a maximum number of preambles transmitted in a PRACH resource configuration.

the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier；

Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, wherein f (Nt) is as followsOne of them is: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with the UE _ ID as input, and f2(Nt) represents a function with Nt as input.

the first wireless frame sequence number of the selected random access resource, the first wireless frame sequence number of the random access preamble, the first wireless superframe sequence number of the selected random access resource, the first wireless superframe sequence number of the random access preamble, and the wireless frame sequence number of the random access preamble initiated by the terminal.

the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod N_carrier+(SFN_idmod N_carrier)]mod N_carrier；

Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of the carriers in the available carrier set is mod, and the residue operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

the sequence number of the carrier selected from the available carrier set is: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier；

The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number where the terminal initiates a random access process, and N is_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

Another embodiment of the present invention provides a method for selecting a random access carrier, including:

acquiring random access information, wherein the random access information comprises a random access triggering condition and/or a sending stage of a random access preamble where a terminal is currently located;

and constructing an available carrier set according to the random access information or the system configuration information, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers.

In this embodiment of the present invention, the random access triggering condition includes:

the MAC sublayer and the RRC sublayer trigger a random access flow;

the PDCCH order triggers a random access process;

monitoring paging to trigger random access process.

In this embodiment of the present invention, the sending phase of the random access preamble includes:

a first attempt to transmit a random access preamble at a current coverage level;

sending a next attempt of a random access preamble at the current coverage level;

jumping to the next coverage grade to send a random access preamble;

sending a random access preamble at the worst coverage level;

the number of random access preamble transmissions reaches a global maximum.

adopting maximum transmitting power at the current coverage level and reaching preset times of attempts to send random access preambles;

the preamble receiving target power at the current coverage level has been set to the maximum power, and attempts to transmit a random access preamble have reached a preset number of times;

attempts to transmit the random access preamble at coverage levels other than the lowest coverage level have been made up to a preset number of times.

In this embodiment of the present invention, the constructing an available carrier set according to system configuration information, and selecting a carrier used for sending a random access preamble for a UE from the available carrier set includes:

constructing an available carrier set according to configuration information broadcasted by a system, and selecting a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm; alternatively, the first and second electrodes may be,

based on the system-indicated dedicated information, a carrier used for transmitting the random access preamble is selected from the available carrier set.

In this embodiment of the present invention, the constructing an available carrier set according to configuration information broadcasted by a system includes:

and constructing an available carrier set based on the configuration information broadcasted by the system and according to the resource use indication broadcasted by the system.

In this embodiment of the present invention, the resource usage indication broadcasted by the system includes one of the following:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether to use an anchor carrier and a non-anchor carrier simultaneously;

an indication of whether an anchor carrier is included.

if the random access resource configuration of the current coverage grade selected by the UE comprises the random access carrier configuration, using all carriers in the random access carrier configuration as an available carrier set;

if the UE receives non-anchor carrier configuration which contains random access resource configuration and is broadcasted by a system, all carriers in the non-anchor carrier configuration and anchor carriers are used as an available carrier set together;

if the UE receives a non-anchor carrier configuration which is broadcasted by a system and contains a random access resource configuration, and the system implicitly or explicitly indicates that a terminal preferentially uses the non-anchor carrier to initiate random access, all carriers in the non-anchor carrier configuration are used as an available carrier set.

In this embodiment of the present invention, the constructing an available carrier set based on the configuration information of the system broadcast and according to the resource usage indication of the system broadcast includes:

if the random access resource configuration of the current coverage grade selected by the UE comprises random access carrier configuration, if the resource use indication indicates that the non-anchor carrier is preferentially used, all the non-anchor carriers in the random access carrier configuration are used as an available carrier set, and if the resource use indication does not indicate that the non-anchor carrier is preferentially used, all the carriers in the random access carrier configuration are used as the available carrier set; if the resource usage indication indicates an indication that the anchor carrier and the non-anchor carrier are used simultaneously, or if the resource usage indication indicates that the anchor carrier is included, using all carriers in the anchor carrier and the random access carrier configuration broadcasted by the system as an available carrier set;

if the UE receives a non-anchor carrier configuration which is broadcasted by a system and contains random access resource configuration, and if the resource use indication indicates that the non-anchor carrier is preferentially used, all carriers in the non-anchor carrier configuration are used as an available carrier set;

if the UE receives a non-anchor carrier configuration which is broadcasted by a system and contains a random access resource configuration, and if the resource use indication does not indicate that the non-anchor carrier is preferentially used, or if the resource use indication indicates that the anchor carrier and the non-anchor carrier are used simultaneously, or if the resource use indication indicates that the anchor carrier is contained, all carriers in the non-anchor carrier configuration and the anchor carrier are used together as an available carrier set.

In this embodiment of the present invention, the selecting, based on the specific information indicated by the system, a carrier used for sending a random access preamble from an available carrier set includes one of:

constructing an available carrier set by using carrier information indicated in the PDCCH order, and selecting a carrier used for sending a random access preamble;

and constructing an available carrier set by using a physical downlink control channel instruction (PDCCH) order resource use indication, and selecting the carrier used for sending the random access preamble.

In the embodiment of the invention, the terminal monitors paging on the carrier wave currently monitoring paging and triggers a random access process, and the method comprises the following steps:

the terminal initiates random access by using the current carrier;

the terminal uses the resource use indication contained in the paging message or in the downlink channel information carrying the paging message to construct an available carrier set, and selects the carrier used for sending the random access preamble to initiate random access;

the terminal uses the carrier information contained in the paging message or the downlink channel information carrying the paging message to construct an available carrier set, and selects the carrier used for sending the random access preamble to initiate random access.

In the embodiment of the present invention, the carrier information is one of the following:

a carrier list comprising anchor carrier frequency points and non-anchor carrier frequency points;

a carrier list comprising anchor carrier sequence numbers and non-anchor carrier sequence numbers;

a carrier list containing non-anchor carrier frequency points;

a carrier list including a non-anchor carrier sequence number;

carrier offset relative to anchor carrier.

In this embodiment of the present invention, the resource usage indication includes one of the following:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

In this embodiment of the present invention, the constructing the set of available carriers by using the resource usage indication includes one of:

if the resource usage indication indicates a priority for using the non-anchor carrier, the terminal may form a set of available carriers using one of: the system broadcasts a non-anchor carrier wave containing random access resource configuration, and the system broadcasts a non-anchor carrier wave in the random access carrier wave configuration contained in the random access resource configuration of the current coverage grade;

if the resource usage indication indicates that the anchor carrier and the non-anchor carrier are used simultaneously, or if the resource usage indication indicates that the anchor carrier is included, the terminal uses one of the following carriers to form an available carrier set: the anchor carrier broadcasted by the system and the non-anchor carrier broadcasted by the system and containing the random access resource configuration, the anchor carrier broadcasted by the system and the non-anchor carrier in the random access carrier configuration contained in the random access resource configuration of the current coverage grade broadcasted by the system.

In the embodiment of the present invention, the carrier selection algorithm includes:

an algorithm for randomly selecting one carrier from a set of available carriers;

and (3) a carrier selection algorithm based on the time domain factor.

if the terminal receives a selection probability factor which is broadcasted by the system and configured for an anchor carrier and/or a non-anchor carrier, the terminal adopts a carrier selection algorithm based on the selection probability factor;

if the terminal does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the terminal receives an indication about adopting one of the following carrier selection algorithms broadcast by the system, the terminal adopts the carrier selection algorithm of one of the following:

and (3) a carrier selection algorithm based on the time domain factor.

In the embodiment of the present invention, the method further includes:

when the terminal receives the message broadcasted by the system, whether the message broadcasted by the system comprises the selection probability factor configured for the anchor carrier and/or the non-anchor carrier is judged.

The device for selecting the random access carrier provided by the embodiment of the invention comprises:

an obtaining unit, configured to obtain a time-domain factor, where the time-domain factor is one of: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal;

a selecting unit, configured to select, according to the time domain factor, a carrier used for performing a random access procedure for the UE in an available carrier set, where the available carrier set includes multiple carriers.

In this embodiment of the present invention, the selecting unit is further configured to select the carrier from the available carrier set with a sequence number of: [ UE _ ID mod Nt]mod N_carrierOr [ UE _ ID/Nt]mod N_carrier；

a PRACH period in a PRACH resource configuration;

a starting subframe location in a PRACH resource configuration;

a maximum number of preambles transmitted in a PRACH resource configuration.

In this embodiment of the present invention, the selecting unit is further configured to select the carrier from the available carrier set with a sequence number of: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier(ii) a Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), whichIn the method, T is a constant and IMSI is used as an input function; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with the UE _ ID as input, and f2(Nt) represents a function with Nt as input.

In this embodiment of the present invention, the selecting unit is further configured to select the carrier from the available carrier set with a sequence number of: [ UE _ ID mod N_carrier+(SFN_id mod N_carrier)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this embodiment of the present invention, the selecting unit is further configured to select the carrier from the available carrier set with a sequence number of: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier(ii) a The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number where the terminal initiates a random access process, and N is_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

Another embodiment of the present invention provides an apparatus for selecting a random access carrier, including:

an obtaining unit, configured to obtain random access information, where the random access information includes a random access trigger condition and/or a sending stage of a random access preamble where a terminal is currently located;

a selecting unit, configured to construct an available carrier set according to the random access information or the system configuration information, and select, from the available carrier set, a carrier used for sending a random access preamble for the UE, where the available carrier set includes multiple carriers.

the MAC sublayer and the RRC sublayer trigger a random access flow;

the PDCCH order triggers a random access process;

monitoring paging to trigger random access process.

jumping to the next coverage grade to send a random access preamble;

sending a random access preamble at the worst coverage level;

the number of random access preamble transmissions reaches a global maximum.

In this embodiment of the present invention, the sending stage of the random access preamble includes:

In the embodiment of the present invention, the selecting unit is further configured to construct an available carrier set according to configuration information broadcasted by a system, and select a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm; alternatively, the carrier used for transmitting the random access preamble is selected from the available carrier set based on the dedicated information indicated by the system.

In this embodiment of the present invention, the selecting unit is further configured to construct an available carrier set based on configuration information of system broadcast and according to a resource usage indication of the system broadcast.

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

In this embodiment of the present invention, the selecting unit is further configured to construct an available carrier set using carrier information indicated in the PDCCH order, and select a carrier used for sending a random access preamble; alternatively, the resource usage indication in the PDCCH order is used to construct a set of available carriers and the carrier used for transmitting the random access preamble is selected.

the terminal initiates random access by using the current carrier;

the terminal uses the resource use indication contained in the paging message or contained in the downlink channel information carrying the paging message to construct an available carrier set, and selects the carrier used for sending the random access preamble to initiate random access;

a carrier list containing non-anchor carrier frequency points;

a carrier list including a non-anchor carrier sequence number;

carrier offset relative to anchor carrier.

In an embodiment of the present invention, the resource usage indication includes one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

if the resource usage indication indicates a priority for using the non-anchor carrier, the terminal may form an available carrier set using one of: the system broadcasts a non-anchor carrier wave containing random access resource configuration, and the system broadcasts a non-anchor carrier wave in the random access carrier wave configuration contained in the random access resource configuration of the current coverage grade;

and (3) a carrier selection algorithm based on the time domain factor.

the system comprises a judging unit, a receiving unit and a processing unit, wherein the judging unit is used for judging whether a selection probability factor which is configured for an anchor carrier and/or a non-anchor carrier and broadcasted by a system is received;

a selecting unit, configured to, if a selection probability factor configured for an anchor carrier and/or a non-anchor carrier broadcasted by the system is received, adopt a carrier selection algorithm based on the selection probability factor; if the system does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the indication broadcast by the system that one of the following carrier selection algorithms is adopted, the carrier selection algorithm of one of the following is adopted: an algorithm for randomly selecting one carrier from a set of available carriers; and (3) a carrier selection algorithm based on the time domain factor.

The electronic device provided by the embodiment of the invention comprises a processor and a memory storing executable instructions of the processor, wherein when the instructions are executed by the processor, the processor executes the following operations: obtaining a time domain factor, wherein the time domain factor is one of the following: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal; and selecting a carrier used for a random access process for the UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers.

In this embodiment of the present invention, the processor is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod Nt]mod N_carrierOr [ UE _ ID/Nt]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: international mobile subscriberThe identity IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this embodiment of the present invention, the processor is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier(ii) a Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with the UE _ ID as input, and f2(Nt) represents a function with Nt as input.

In an embodiment of the present invention, the processor is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod N_carrier+(SFN_id mod N_carrier)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this embodiment of the present invention, the processor is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier(ii) a The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number where the terminal initiates a random access process, and N is_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

Another embodiment of the present invention provides an electronic device, which includes a processor and a memory storing instructions executable by the processor, and when the instructions are executed by the processor, the processor performs the following operations: acquiring random access information, wherein the random access information comprises a random access triggering condition and/or a sending stage of a random access preamble where a terminal is currently located; and constructing an available carrier set according to the random access information or the system configuration information, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers.

In this embodiment of the present invention, the processor is further configured to perform the following operations: constructing an available carrier set according to configuration information broadcasted by a system, and selecting a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm; alternatively, the carrier used for transmitting the random access preamble is selected from the available carrier set based on the dedicated information indicated by the system.

In this embodiment of the present invention, the processor is further configured to perform the following operations: if the random access resource configuration of the current coverage grade selected by the UE comprises the random access carrier configuration, using all carriers in the random access carrier configuration as an available carrier set; if the UE receives non-anchor carrier configuration which contains random access resource configuration and is broadcasted by a system, all carriers in the non-anchor carrier configuration and anchor carriers are used as an available carrier set together; if the UE receives a non-anchor carrier configuration which is broadcasted by a system and contains a random access resource configuration, and the system implicitly or explicitly indicates that a terminal preferentially uses the non-anchor carrier to initiate random access, all carriers in the non-anchor carrier configuration are used as an available carrier set.

Another embodiment of the present invention provides an electronic device, which includes a processor and a memory storing instructions executable by the processor, and when the instructions are executed by the processor, the processor performs the following operations: if a selection probability factor which is broadcasted by the system and configured for an anchor carrier and/or a non-anchor carrier is received, a carrier selection algorithm based on the selection probability factor is adopted; if a selection probability factor configured for the anchor carrier and/or the non-anchor carrier and broadcasted by the system is not received, or an indication about adopting one of the following carrier selection algorithms and broadcasted by the system is received, adopting the carrier selection algorithm of one of the following: an algorithm for randomly selecting one carrier from a set of available carriers; and (3) a carrier selection algorithm based on the time domain factor.

In the technical scheme of the embodiment of the invention, a time domain factor is obtained, wherein the time domain factor is one of the following factors: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal; and selecting the carrier used for the random access process for the terminal UE in the available carrier set according to the time domain factor. In addition, random access information is obtained, wherein the random access information comprises a random access trigger condition and/or a sending stage of a random access preamble where the terminal is currently located; and selecting the carrier used for sending the random access preamble for the UE in the available carrier set according to the random access information or the system configuration information. Therefore, various types of terminals can select a proper random access carrier, the carrier load selection in the available carrier set is balanced, and the method is suitable for the NB-IoT random access process.

Drawings

The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.

Fig. 1 is a first flowchart illustrating a method for selecting a random access carrier according to an embodiment of the present invention;

fig. 2 is a second flowchart illustrating a method for selecting a random access carrier according to an embodiment of the present invention;

fig. 3 is a third flowchart illustrating a method for selecting a random access carrier according to an embodiment of the present invention;

fig. 4 is a first schematic structural diagram illustrating a device for selecting a random access carrier according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a random access carrier selection apparatus according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a hardware structure according to an embodiment of the present invention.

Detailed Description

So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.

Fig. 1 is a first flowchart illustrating a method for selecting a random access carrier according to an embodiment of the present invention, where the method for selecting a random access carrier in this example is applied to a UE, and as shown in fig. 1, the method for selecting a random access carrier includes the following steps:

step 101: obtaining a time domain factor, wherein the time domain factor is one of the following: the wireless frame number of the random access process initiated by the terminal and the time domain resource information factor of the random access process initiated by the terminal.

Step 102: and selecting a carrier used for a random access process for the UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers.

In this embodiment, selecting a carrier used for performing a random access procedure for the UE in the available carrier set according to the time domain factor includes:

Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), a function with IMSI as input, where T is a constant. T may take on values of 1024, 4096, or others.

a PRACH period (nprach-Periodicity) in a Physical Random Access Channel (PRACH) resource configuration;

a starting subframe position (nprach-StartTime) in PRACH resource configuration;

a maximum number of attempts to transmit each preamble in the PRACH resource configuration;

a maximum number of preambles transmitted in a PRACH resource configuration.

Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with the UE _ ID as input, and f2(Nt) represents a function with Nt as input.

the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (SFN _ ID)]modN_carrier；

Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (SFN _ id) represents a function with SFN _ id as input. T may take the value 1024, 4096, or other values. f (SFN _ id) may be k × SFN _ id, k being a constant. When k is 1, f (SFN _ id) is SFN _ id.

the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod N_carrier+(f(SFN_id)mod N_carrier)]mod N_carrier；

the sequence number of the carrier selected from the available carrier set is: [ Carrier _ index + (f (SFN _ id) mod N [ ]_carrier)]mod N_carrier；

The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number where the terminal initiates a random access process, and f (SFN _ id) represents that SFN _ id is used asThe function of the inputs, f (SFN _ id), may be k x SFN _ id, k being a constant. When k is 1, f (SFN _ id) is SFN _ id. N is a radical of_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

Fig. 2 is a flowchart illustrating a second method for selecting a random access carrier according to an embodiment of the present invention, where the method for selecting a random access carrier in this example is applied to a UE, and as shown in fig. 2, the method for selecting a random access carrier includes the following steps:

step 201: and acquiring random access information, wherein the random access information comprises a random access triggering condition and/or a sending stage of a random access preamble where the terminal is currently located.

Step 202: and constructing an available carrier set according to the random access information or the system configuration information, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers.

a Media Access Control (MAC) sublayer and a Radio Resource Control (RRC) sublayer trigger a random Access procedure;

a physical downlink control channel instruction (PDCCH order) triggers a random access process;

monitoring paging to trigger random access process.

jumping to the next coverage grade to send a random access preamble;

sending a random access preamble at the worst coverage level;

the number of random access preamble transmissions reaches a global maximum.

and selecting the carrier used for sending the random access preamble from the available carrier set based on the special information indicated by the system.

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

if the UE receives non-anchor carrier configuration which is broadcasted by a system and contains random access resource configuration, all carriers in the non-anchor carrier configuration and anchor carriers are used as an available carrier set together;

the terminal initiates random access by using the current carrier;

a carrier list containing non-anchor carrier frequency points;

a carrier list including a non-anchor carrier sequence number;

carrier offset relative to anchor carrier.

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

if the resource usage indication indicates a priority for using the non-anchor carrier or if the resource usage indication indicates that the anchor carrier is included, the terminal may form the set of available carriers using one of: the system broadcasts a non-anchor carrier wave containing random access resource configuration, and the system broadcasts a non-anchor carrier wave in the random access carrier wave configuration contained in the random access resource configuration of the current coverage grade;

if the resource usage indication indicates that the anchor carrier and the non-anchor carrier are used simultaneously, the terminal constructs an available carrier set by using one of the following carriers: the anchor carrier broadcasted by the system and the non-anchor carrier broadcasted by the system and containing the random access resource configuration, the anchor carrier broadcasted by the system and the non-anchor carrier in the random access carrier configuration contained in the random access resource configuration of the current coverage grade broadcasted by the system.

and (3) a carrier selection algorithm based on the time domain factor.

the terminal may stop using or ignore the resource usage indication when it has sent the random access preamble a certain number of times, or based on other system preset conditions, such as a preset timer timeout, the terminal is constructing a set of available carriers, and/or uses a carrier selection algorithm.

Fig. 3 is a third flowchart of a method for selecting a random access carrier according to an embodiment of the present invention, where the method for selecting a random access carrier in this example is applied to a UE, and as shown in fig. 3, the method for selecting a random access carrier includes the following steps:

step 301: if the terminal receives the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcasted by the system, the terminal adopts a carrier selection algorithm based on the selection probability factor.

In an embodiment of the present invention, the method further includes:

and when the terminal receives the message broadcasted by the system, judging whether the message broadcasted by the system comprises the selection probability factor configured for the anchor carrier and/or the non-anchor carrier.

Step 302: if the terminal does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the terminal receives an indication about adopting one of the following carrier selection algorithms broadcast by the system, the terminal adopts the carrier selection algorithm of one of the following: an algorithm for randomly selecting one carrier from a set of available carriers; and (3) a carrier selection algorithm based on the time domain factor.

The step 301 and the step 302 have no execution sequence.

The method for selecting a random access carrier according to the embodiment of the present invention is further described below with reference to specific scenarios.

Example 1

The terminal triggers a random access flow due to the MAC sublayer and the RRC sublayer, or the terminal triggers the random access flow after receiving the PDCCH order, and the PDCCH order does not contain indication carrier information. The terminal selects one carrier in the set to initiate random access, i.e. the first repetition of the first attempt to send a random access preamble, either based on an existing carrier selection algorithm or randomly.

To ensure energy accumulation, the terminal uses the previously selected carrier when transmitting all repetitions of the attempt.

After each attempt of the terminal to send the random access preamble under the current coverage level fails, before the next attempt is sent, in order to improve the access success probability, the terminal reselects a carrier from an available carrier set by using a carrier selection algorithm containing a time domain factor to send the next attempt.

When the terminal fails to send the random access preamble under the current coverage level, the terminal jumps to the next coverage level, if the random access resource configuration of the coverage level comprises the random access carrier configuration, the terminal constructs a new available carrier set by using all carriers in the random access carrier configuration, and selects one carrier from the available carrier set by using a carrier selection algorithm comprising a time domain factor to send a new attempt.

And if the random access carrier configuration is not contained in the random access resource configuration of the coverage level, the terminal sends the random access preamble by default by using the anchor carrier.

Here, carriers are selected from the small available carrier set configured for each coverage class, and then the available carrier set may be updated or a new carrier selection algorithm may be used for each attempt or coverage class replacement.

Example 2

If the system broadcasts non-anchor carrier configuration containing random access resource configuration and the system implicitly or explicitly indicates that the terminal preferentially uses the non-anchor carrier to initiate random access, the terminal uses all carriers in the non-anchor carrier configuration as an available carrier set, or the terminal uses all carriers in the non-anchor carrier configuration and the anchor carrier together as the available carrier set. Then, the terminal selects a carrier in the set based on a carrier selection algorithm containing a time domain factor preferentially, and initiates random access by using the random access resource configuration matched with the current coverage grade in the carrier, namely, the first repetition of the first attempt of sending the random access preamble.

Each attempt by the terminal to send a random access preamble at the current coverage level uses the previously selected carrier.

When the terminal fails to send the random access preamble under the current coverage level, the terminal still uses the carrier wave selected before and uses the next coverage level parameter in the random access resource configuration to send the random access preamble.

Here, a carrier is first selected from a larger set of available carriers, and then this one carrier is used for each attempt, or change of coverage level.

Example 3

When the terminal monitors paging on the carrier currently monitoring paging and triggers a random access process, the terminal initiates random access by using the current carrier.

Example 4

And the terminal receives the PDCCH order and triggers a random access process. The terminal determines a carrier for transmitting a random access preamble using carrier information indicated in the PDCCH order. If the carrier information indicated in the PDCCH order contains a plurality of available carriers, the terminal preferentially selects one carrier from the plurality of available carriers to initiate random access based on a carrier selection algorithm containing a time domain factor.

Fig. 4 is a first schematic structural diagram of a device for selecting a random access carrier according to an embodiment of the present invention.

In an embodiment of the present invention, the apparatus for selecting a random access carrier includes:

an obtaining unit 41, configured to obtain a time-domain factor, where the time-domain factor is one of: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal;

a selecting unit 42, configured to select, according to the time domain factor, a carrier used for performing a random access procedure for the UE in an available carrier set, where the available carrier set includes multiple carriers.

In this example, the selecting unit 42 is further configured to select a carrier from the available carrier set, where the sequence number of the carrier is: [ UE _ ID mod Nt]mod N_carrierOr [ UE _ ID/Nt ]]mod N_carrier；

Wherein, UE _ ID is terminal identification, Nt is the terminalTime domain resource information factor, N, to initiate a random access procedure_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this example, the time domain resource information factor of the terminal initiating the random access process is one or any combination of the following:

a PRACH period in a PRACH resource configuration;

a starting subframe position in a PRACH resource configuration;

a maximum number of preambles transmitted in a PRACH resource configuration.

In this example, the selecting unit 42 is further configured to select a carrier from the available carrier set, where the sequence number of the carrier is: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier(ii) a Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with the UE _ ID as input, and f2(Nt) represents a function with Nt as input.

In this example, theThe selecting unit 42 is further configured to select a carrier from the available carrier set with a sequence number of: [ UE _ ID + f (SFN _ ID)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (SFN _ id) represents a function with SFN _ id as input.

In this example, the selecting unit 42 is further configured to select a carrier from the available carrier set, where the sequence number of the carrier is: [ UE _ ID mod N_carrier+(SFN_id mod N_carrier)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame number of the random access process initiated by the terminal, and N is_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this example, the selecting unit 42 is further configured to select a carrier from the available carrier set, where the sequence number of the carrier is: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier(ii) a The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number where the terminal initiates a random access process, and N is_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

In another embodiment of the present invention, the apparatus for selecting a random access carrier includes:

an obtaining unit 41, configured to obtain random access information, where the random access information includes a random access trigger condition and/or a sending stage of a random access preamble where a terminal is currently located;

a selecting unit 42, configured to construct an available carrier set according to the random access information or the system configuration information, and select a carrier used for sending a random access preamble for the UE from the available carrier set, where the available carrier set includes multiple carriers.

In this example, the random access trigger condition includes:

the MAC sublayer and the RRC sublayer trigger a random access flow;

a physical downlink control channel instruction PDCCH order triggers a random access process;

monitoring paging to trigger random access process.

In this example, the sending phase of the random access preamble includes:

jumping to the next coverage grade to send a random access preamble;

sending a random access preamble at the worst coverage level;

the number of random access preamble transmissions reaches a global maximum.

In this example, the sending phase of the random access preamble includes:

In this example, the selecting unit 42 is further configured to construct an available carrier set according to configuration information broadcasted by the system, and select a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm; alternatively, the carrier used for transmitting the random access preamble is selected from the available carrier set based on the dedicated information indicated by the system.

In this example, the selecting unit 42 is further configured to construct an available carrier set based on the configuration information of the system broadcast and according to the resource usage indication of the system broadcast.

In this example, the system broadcast resource usage indication includes one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

In this example, the constructing the set of available carriers according to the configuration information broadcasted by the system includes:

if the UE receives non-anchor carrier configuration which is broadcasted by a system and contains random access resource configuration, and the system implicitly or explicitly indicates a terminal to preferentially use the non-anchor carrier to initiate random access, all carriers in the non-anchor carrier configuration are used as an available carrier set.

In this example, the constructing the set of available carriers based on the configuration information of the system broadcast and according to the resource usage indication of the system broadcast includes:

In this example, the selecting unit 42 is further configured to construct an available carrier set using carrier information indicated in the PDCCH order, and select a carrier used for sending a random access preamble; alternatively, the resource usage indication in the PDCCH order is used to construct a set of available carriers and the carrier used for transmitting the random access preamble is selected.

In this example, the terminal monitors paging on a carrier currently monitoring paging and triggers a random access procedure, which includes one of:

the terminal initiates random access by using the current carrier;

In this example, the carrier information is one of the following:

a carrier list containing non-anchor carrier frequency points;

a carrier list including a non-anchor carrier sequence number;

carrier offset relative to anchor carrier.

In this example, the resource usage indication comprises one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

In this example, if the resource usage indication indicates a priority for using the non-anchor carrier, the terminal may form the set of available carriers using one of: the system broadcasts a non-anchor carrier wave containing random access resource configuration, and the system broadcasts a non-anchor carrier wave in the random access carrier wave configuration contained in the random access resource configuration of the current coverage grade;

In this example, the carrier selection algorithm includes:

and (3) a carrier selection algorithm based on the time domain factor.

Fig. 5 is a schematic structural diagram of a second apparatus for selecting a random access carrier according to an embodiment of the present invention, where the apparatus includes:

a judging unit 51, configured to judge whether a selection probability factor configured for an anchor carrier and/or a non-anchor carrier and broadcasted by the system is received;

a selecting unit 52, configured to, if a selection probability factor configured for an anchor carrier and/or a non-anchor carrier broadcast by the system is received, adopt a carrier selection algorithm based on the selection probability factor; if the system does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the indication broadcast by the system that one of the following carrier selection algorithms is adopted, the carrier selection algorithm of one of the following is adopted: an algorithm for randomly selecting one carrier from a set of available carriers; and (3) a carrier selection algorithm based on the time domain factor.

An electronic device is further provided in an embodiment of the present invention, as shown in fig. 6, and includes a processor 1301 and a memory 1302 storing executable instructions of the processor 1301, where when the instructions are executed by the processor 1301, the processor 1301 performs the following operations: obtaining a time domain factor, wherein the time domain factor is one of the following: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal; and selecting a carrier used for a random access process for the UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers.

In this example, the processor 1301 is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod Nt]mod N_carrierOr [ UE _ ID/Nt]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: international mobile subscriber identity IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this example, the processor 1301 is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier(ii) a Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with the UE _ ID as input, and f2(Nt) represents a function with Nt as input.

In this example, the processor 1301 is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (SFN _ ID)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (SFN _ id) represents a function with SFN _ id as input.

In this example, the processor 1301 is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod N_carrier+(SFN_id mod N_carrier)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant function with IMSI as input.

In this example, the processor 1301 is further configured to perform the following operations: the sequence number of the carrier selected from the available carrier set is: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier(ii) a The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number of a random access process initiated by the terminal，N_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

An embodiment of the present invention further provides an electronic device, which includes a processor 1301 and a memory 1302 storing executable instructions of the processor 1301, where when the instructions are executed by the processor 1301, the processor 1301 performs the following operations: acquiring random access information, wherein the random access information comprises a random access triggering condition and/or a sending stage of a random access preamble where a terminal is currently located; and constructing an available carrier set according to the random access information or the system configuration information, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers.

In this example, the processor 1301 is further configured to perform the following operations: constructing an available carrier set according to configuration information broadcasted by a system, and selecting a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm; alternatively, the carrier used for transmitting the random access preamble is selected from the available carrier set based on the dedicated information indicated by the system.

In this example, the processor 1301 is further configured to perform the following operations: if the random access resource configuration of the current coverage grade selected by the UE comprises the random access carrier configuration, using all carriers in the random access carrier configuration as an available carrier set; if the UE receives non-anchor carrier configuration which contains random access resource configuration and is broadcasted by a system, all carriers in the non-anchor carrier configuration and anchor carriers are used as an available carrier set together; if the UE receives a non-anchor carrier configuration which is broadcasted by a system and contains a random access resource configuration, and the system implicitly or explicitly indicates that a terminal preferentially uses the non-anchor carrier to initiate random access, all carriers in the non-anchor carrier configuration are used as an available carrier set.

An embodiment of the present invention further provides an electronic device, which includes a processor 1301 and a memory 1302 storing executable instructions of the processor 1301, where when the instructions are executed by the processor 1301, the processor 1301 performs the following operations: if a selection probability factor which is broadcasted by the system and configured for an anchor carrier and/or a non-anchor carrier is received, a carrier selection algorithm based on the selection probability factor is adopted; if the system does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the indication broadcast by the system that one of the following carrier selection algorithms is adopted, the carrier selection algorithm of one of the following is adopted: an algorithm for randomly selecting one carrier from a set of available carriers; and (3) a carrier selection algorithm based on the time domain factor.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for selecting a random access carrier, the method comprising:

selecting a carrier used for a random access process for terminal UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers;

the selecting a carrier used for the random access process for the terminal UE in the available carrier set according to the time domain factor includes:

Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: international mobile subscriber identity IMSI, (IMSI mod T), where T is a constant and is a function with IMSI as input;

or, the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (Nt)]mod N_carrierOr is or：F([UE_ID+f(Nt)])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier；

Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, and N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with UE _ ID as input, f2(Nt) represents a function with Nt as input;

or, the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod N_carrier+(SFN_id mod N_carrier)]mod N_carrier；

Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input;

or, the sequence number of the carrier selected from the available carrier set is: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier；

2. The method for selecting a random access carrier according to claim 1, wherein the time domain resource information factor for the terminal to initiate the random access procedure is one or any combination of the following:

a PRACH period in a physical random access channel PRACH resource configuration;

a starting subframe position in a PRACH resource configuration;

a maximum number of preambles transmitted in a PRACH resource configuration.

3. The method for selecting a random access carrier according to claim 1, wherein the time domain resource information factor for the terminal to initiate the random access procedure is one or any combination of the following:

4. A method for selecting a random access carrier, the method comprising:

according to the random access information or the system configuration information, constructing an available carrier set, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers;

the constructing available carrier wave set according to the system configuration information and selecting the carrier wave used for sending the random access preamble for the UE from the available carrier wave set comprises the following steps:

constructing an available carrier set according to configuration information broadcasted by a system, and selecting a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm;

the constructing of the available carrier set according to the configuration information broadcasted by the system comprises:

constructing an available carrier set based on the configuration information of the system broadcast and according to the resource use indication of the system broadcast;

the configuring information based on system broadcast and constructing an available carrier set according to the resource use indication of system broadcast includes:

5. The method of claim 4, wherein the random access trigger condition comprises:

a Medium Access Control (MAC) sub-layer and a Radio Resource Control (RRC) sub-layer trigger a random access process;

monitoring paging to trigger random access process.

6. The method of claim 4, wherein the random access preamble transmission phase comprises:

jumping to the next coverage grade to send a random access preamble;

sending a random access preamble at the worst coverage level;

the number of random access preamble transmissions reaches a global maximum.

7. Method for selecting a random access carrier according to any of claims 4 to 6, characterized in that the phase of sending the random access preamble comprises:

adopting maximum transmitting power at the current coverage level, wherein the attempt of sending the random access preamble reaches the preset times;

8. The method of claim 4, wherein the constructing a set of available carriers according to the system configuration information and selecting a carrier used for sending a random access preamble for the UE from the set of available carriers comprises:

9. The method of claim 4, wherein the system-broadcasted resource usage indication comprises one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

10. The method of claim 4, wherein the constructing the set of available carriers according to the configuration information broadcasted by the system comprises:

11. The method of claim 8, wherein the selecting the carrier used for sending the random access preamble from the available carrier set based on the specific information indicated by the system comprises one of:

12. The method of claim 5, wherein the terminal monitors paging on a carrier currently monitoring paging and triggers a random access procedure, and the method comprises one of the following steps:

the terminal initiates random access by using the current carrier;

13. The method of claim 11 or 12, wherein the carrier information is one of:

a carrier list containing non-anchor carrier frequency points;

a carrier list including a non-anchor carrier sequence number;

carrier offset relative to anchor carrier.

14. The method of claim 11 or 12, wherein the resource usage indication comprises one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

15. A method of selecting a random access carrier according to claim 11 or 12, wherein the use of the resource usage indication to construct the set of available carriers comprises one of:

16. The method of claim 4, wherein the carrier selection algorithm comprises:

and (3) a carrier selection algorithm based on the time domain factor.

17. A method for selecting a random access carrier, the method comprising:

if the terminal does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcasted by the system, or the terminal receives an indication about adopting one of the following carrier selection algorithms broadcasted by the system, the terminal adopts one of the following carrier selection algorithms:

a carrier selection algorithm based on time domain factors;

18. An apparatus for selecting a random access carrier, the apparatus comprising:

a selecting unit, configured to select, according to the time domain factor, a carrier used for a random access process for a UE in an available carrier set, where the available carrier set includes multiple carriers;

the selection unit is further configured to:

Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input;

or, the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier(ii) a Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) indicates that the UE _ ID is used as inputA function, f2(Nt), represents a function with Nt as input;

or, the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod N_carrier+(SFN_id mod N_carrier)]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, SFN _ ID is wireless frame serial number of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input;

or, the sequence number of the carrier selected from the available carrier set is: [ Carrier _ index + (SFN _ id mod N)_carrier)]mod N_carrier(ii) a The Carrier _ index is a sequence number of a Carrier which is obtained by primary calculation according to the following algorithm: a random algorithm, a carrier priority algorithm and a carrier selection probability algorithm, wherein SFN _ id is a wireless frame serial number where the terminal initiates a random access process, and N is_carrierMod is the total number of carriers in the set of available carriers and the remainder operation.

19. The apparatus for selecting a random access carrier according to claim 18, wherein the time domain resource information factor for the terminal to initiate the random access procedure is one or any combination of the following:

a PRACH period in a PRACH resource configuration;

a starting subframe position in a PRACH resource configuration;

a maximum number of preambles transmitted in a PRACH resource configuration.

20. The apparatus for selecting a random access carrier according to claim 18, wherein the time domain resource information factor for the terminal to initiate the random access procedure is one or any combination of the following:

21. An apparatus for selecting a random access carrier, the apparatus comprising:

a selecting unit, configured to construct an available carrier set according to the random access information or the system configuration information, and select a carrier used for sending a random access preamble for the UE from the available carrier set, where the available carrier set includes multiple carriers;

the selection unit is further configured to construct an available carrier set according to configuration information broadcasted by the system, and select a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm;

the selection unit is further configured to construct an available carrier set based on configuration information of system broadcast and according to a resource usage indication of the system broadcast;

22. The apparatus of claim 21, wherein the random access trigger condition comprises:

the MAC sublayer and the RRC sublayer trigger a random access flow;

monitoring paging to trigger random access process.

23. The apparatus for selecting a random access carrier as claimed in claim 21, wherein the transmitting phase of the random access preamble comprises:

jumping to the next coverage grade to send a random access preamble;

sending a random access preamble at the worst coverage level;

the number of random access preamble transmissions reaches a global maximum.

24. Selection apparatus of a random access carrier according to any of claims 21 to 23, wherein the transmission phase of the random access preamble comprises:

25. The apparatus of claim 21, wherein the selecting unit selects the carrier used for sending the random access preamble from a set of available carriers based on specific information indicated by a system.

26. The apparatus for selecting a random access carrier of claim 21, wherein the system broadcast resource usage indication comprises one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

27. The apparatus for selecting a random access carrier according to claim 21, wherein the constructing a set of available carriers according to configuration information broadcasted by a system comprises:

28. The apparatus of claim 21, wherein the selecting unit is further configured to use carrier information indicated in the PDCCH order to construct a set of available carriers, and to select the carrier used for sending the random access preamble; alternatively, the resource usage indication in the PDCCH order is used to construct a set of available carriers and the carrier used for transmitting the random access preamble is selected.

29. The device for selecting a random access carrier according to claim 22, wherein the terminal monitors paging on the carrier currently monitoring paging and triggers a random access procedure, comprising one of:

the terminal initiates random access by using the current carrier;

30. A selection apparatus of a random access carrier as claimed in claim 28 or 29, wherein the carrier information is one of:

a carrier list containing non-anchor carrier frequency points;

a carrier list including a non-anchor carrier sequence number;

carrier offset relative to anchor carrier.

31. Selection apparatus of a random access carrier according to claim 28 or 29, wherein the resource usage indication comprises one of:

an indication of whether to prioritize use of non-anchor carriers;

an indication of whether an anchor carrier is included.

32. Selection apparatus of a random access carrier according to claim 28 or 29, wherein the use of the resource usage indication to construct a set of available carriers comprises one of:

33. The apparatus for selecting a random access carrier of claim 21, wherein the carrier selection algorithm comprises:

and (3) a carrier selection algorithm based on the time domain factor.

34. An apparatus for selecting a random access carrier, the apparatus comprising:

the judging unit is used for judging whether a selection probability factor which is broadcasted by the system and configured for an anchor carrier and/or a non-anchor carrier is received;

a selecting unit, configured to, if a selection probability factor configured for an anchor carrier and/or a non-anchor carrier broadcasted by the system is received, adopt a carrier selection algorithm based on the selection probability factor; if the system does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the indication broadcast by the system that one of the following carrier selection algorithms is adopted, the carrier selection algorithm of one of the following is adopted: an algorithm for randomly selecting one carrier from a set of available carriers; a carrier selection algorithm based on time domain factors;

35. An electronic device comprising a processor and a memory storing processor-executable instructions that, when executed by the processor, perform operations comprising: obtaining a time domain factor, wherein the time domain factor is one of the following: a wireless frame number of a random access process initiated by a terminal and a time domain resource information factor of the random access process initiated by the terminal; selecting a carrier used for a random access process for the UE in an available carrier set according to the time domain factor, wherein the available carrier set comprises a plurality of carriers;

the processor is further configured to perform the following operations:

the sequence number of the carrier selected from the available carrier set is: [ UE _ ID mod Nt]mod N_carrierOr [ UE _ ID/Nt]mod N_carrier(ii) a Wherein, UE _ ID is terminal identification, Nt is time domain resource information factor of the terminal initiating random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed;the terminal identification is one of the following: international mobile subscriber identity IMSI, (IMSI mod T), where T is a constant and is a function with IMSI as input;

or, the sequence number of the carrier selected from the available carrier set is: [ UE _ ID + f (Nt)]mod N_carrierOr, alternatively: f ([ UE _ ID + F (Nt))])mod N_carrierOr, alternatively: f (F1(UE _ ID) + F2(Nt)) mod N_carrier(ii) a Wherein, F () is a rounding function, UE _ ID is a terminal identification, Nt is a time domain resource information factor of the terminal initiating a random access process, N_carrierThe total number of carriers in the available carrier set is mod, and the remainder operation is performed; the terminal identification is one of the following: IMSI, (IMSI mod T), where T is a constant, function with IMSI as input; f (Nt) represents a function with Nt as input, said f (Nt) being one of: nt mod K1 and Nt/K2, wherein K1 and K2 are constants; f1(UE _ ID) represents a function with UE _ ID as input, f2(Nt) represents a function with Nt as input;

36. An electronic device comprising a processor and a memory storing processor-executable instructions that, when executed by the processor, cause the processor to: acquiring random access information, wherein the random access information comprises a random access triggering condition and/or a sending stage of a random access preamble where a terminal is currently located; according to the random access information or the system configuration information, constructing an available carrier set, and selecting a carrier used for sending a random access preamble for the UE from the available carrier set, wherein the available carrier set comprises a plurality of carriers;

the processor is further configured to perform the following operations: constructing an available carrier set according to configuration information broadcasted by a system, and selecting a carrier used for sending a random access preamble from the available carrier set by using a carrier selection algorithm;

37. The electronic device of claim 36, wherein the processor is further configured to: based on the system-indicated dedicated information, a carrier used for transmitting the random access preamble is selected from the available carrier set.

38. The electronic device of claim 36, wherein the processor is further configured to: if the random access resource configuration of the current coverage grade selected by the UE comprises the random access carrier configuration, using all carriers in the random access carrier configuration as an available carrier set; if the UE receives non-anchor carrier configuration which contains random access resource configuration and is broadcasted by a system, all carriers in the non-anchor carrier configuration and anchor carriers are used as an available carrier set together; if the UE receives a non-anchor carrier configuration which is broadcasted by a system and contains a random access resource configuration, and the system implicitly or explicitly indicates that a terminal preferentially uses the non-anchor carrier to initiate random access, all carriers in the non-anchor carrier configuration are used as an available carrier set.

39. An electronic device comprising a processor and a memory storing processor-executable instructions that, when executed by the processor, perform operations comprising: if a selection probability factor which is broadcasted by the system and configured for an anchor carrier and/or a non-anchor carrier is received, a carrier selection algorithm based on the selection probability factor is adopted; if the system does not receive the selection probability factor configured for the anchor carrier and/or the non-anchor carrier broadcast by the system, or the indication broadcast by the system that one of the following carrier selection algorithms is adopted, the carrier selection algorithm of one of the following is adopted: an algorithm for randomly selecting one carrier from a set of available carriers; a carrier selection algorithm based on time domain factors;