CN111447672A - Timing advance indicating method and device - Google Patents

Timing advance indicating method and device Download PDF

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CN111447672A
CN111447672A CN202010163785.XA CN202010163785A CN111447672A CN 111447672 A CN111447672 A CN 111447672A CN 202010163785 A CN202010163785 A CN 202010163785A CN 111447672 A CN111447672 A CN 111447672A
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random access
value
access response
request signal
ith
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CN111447672B (en
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焦慧颖
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China Academy of Information and Communications Technology CAICT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

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Abstract

The method comprises the following steps of sending an ith random access request signal by using PRACH resources, sending an i +1 Th random access request signal when TA is more than or equal to s × i × Th and sending a random access response containing information indicating a Th value until TA < s × N × Th, wherein the random access response contains information indicating a TA/s- (N-1) × Th value, i, i +1, N ∈ [1, N ], TA is an uplink timing advance target value, Th is a threshold value, and s is a preset coefficient.

Description

Timing advance indicating method and device
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a timing advance indication method and device for random access.
Background
In the NR system, in the random access response, the base station provides a value of timing advance (timing advance) to the terminal to be applied in the next uplink transmission. In the ground network, the differential time delay between two terminals in a cell corresponds to the measured one-way time delay of the two terminals relative to the base station.
For example, in the 3GPP NR standard, the maximum timing advance value indicated by the random access response is 2ms at a subcarrier spacing of 15kHz, and the corresponding maximum distance compensation range is 300 km. In a non-terrestrial communication system, because a base station is far away from a terminal, the radius of a cell can reach more than 500km, even 1500km, and a time delay range indicated by the existing NR standard cannot meet the requirement.
Aiming at the problem that the time delay range indicated by the NR standard can not meet the requirement, the invention provides a new Random Access channel (PRACH) flow, so that the existing Random Access Response (RAR) technology can be reused to indicate the uplink timing advance range of the terminal.
Disclosure of Invention
The application provides a timing advance indicating method and a device, which solve the problems that the range of an uplink timing advance value indicated in random access response is small and the requirements of a non-ground communication system cannot be met.
In a first aspect, an embodiment of the present application provides a timing advance indicating method, including the following steps:
sending an ith random access request signal by using a PRACH resource;
when TA is larger than or equal to s × i × Th, the ith random access response contains information indicating the Th value, and then the (i +1) Th random access request signal is sent;
repeating the foregoing steps until TA < s × n × Th, the random access response including information indicative of a TA/s- (n-1) × Th value;
wherein, i, i +1, N ∈ [1, N ], TA is an uplink timing advance target value, Th is a threshold value, s is a preset coefficient, and preferably, s is configured by a higher layer signaling.
In the embodiment, s is optionally 1, and in this case, the value of s may be default or configured.
In an embodiment, optionally s >1, s being preconfigured and/or base station configured to the terminal.
Preferably, in the N types of PRACH resources, the ith random access request signal is carried by the ith PRACH resource. Further preferably, the PRACH resources are classified according to at least 1 of a preamble sequence code, a time resource, and a frequency resource. Or, the PRACH resources are classified according to a combination of at least 2 kinds of information in a preamble sequence code, a time resource, and a frequency resource.
The method is used for network equipment and comprises the following steps:
receiving an ith random access request signal;
determining a TA value according to the characteristics of the random access request signal;
if TA is greater than or equal to s × i × Th, determining V (i) as Th;
transmitting an ith random access response including information indicating a value of V (i);
where v (i) denotes a signaling value in the ith random access response.
The method of the embodiment of the application is used for the network equipment, and further comprises the following steps:
if TA < s × (i +1) × Th, determining V (i +1) as TA/s-i × Th;
and transmitting the (i +1) th random access response, wherein the (i +1) th random access response contains information used for indicating the value of the V (i + 1).
The method is used for the terminal equipment and comprises the following steps:
sending an ith random access request signal;
receiving an ith random access response and information therein indicating a value of V (i);
when v (i) < Th, TA ═ s × (i-1) × Th + s × v (i);
where v (i) denotes a signaling value in the ith random access response.
Preferably, the method of the present application is applied to a terminal device, and further includes the following steps:
transmitting an i +1 Th random access request signal when V (i) ═ Th, receiving a random access response of the i +1 Th PRACH resource and information indicating a V (i +1) value therein, repeating the foregoing steps until V (n) < Th, and determining TA ═ s × (n-1) × Th + s × V (n).
Preferably, the method of the present application is applied to a terminal device, and further includes the following steps:
the timing advance for transmitting the i +1 th random access request signal is
Figure BDA0002406699810000031
Preferably, the method of the present application is applied to a terminal device, and further includes the following steps:
when receiving v (n) < Th, TA is s × (n-1) × Th + s × v (n) is used as the timing advance of the random access request signal.
In a second aspect, an embodiment of the present application further provides a network device, configured to be used in the method of any one of the embodiments of the first aspect of the present application, where the network device is configured to:
receiving an ith random access request signal, determining a TA value according to the characteristics of the random access request signal, if the TA is more than or equal to s × i × Th, determining V (i) to be Th, and sending an ith random access response containing information for indicating a value of V (i), wherein V (i) represents a signaling value in the ith random access response.
Further, the network device is further configured to:
if TA < s × (i +1) × Th, V (i +1) is determined to be TA/s-i × Th, an i +1 Th random access response is transmitted, including information indicating a V (i +1) value.
An embodiment of the present application further provides a network device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of the embodiments of the present application applicable to a network device.
In a third aspect, the present application further provides a terminal device, configured to implement the method in any one of the embodiments of the first aspect of the present application, where the terminal device is configured to:
the method includes transmitting an ith random access request signal, receiving an ith random access response and information indicating a value of V (i), and determining TA (s × (i-1) × Th + s × V (i +1) when V (i +1) < Th, wherein V (i) represents a signaling value in the ith random access response.
Further, the terminal device is further configured to:
transmitting an i +1 Th random access request signal when V (i) ═ Th, receiving an i +1 Th random access response and information therein indicating a value of V (i +1), repeating the foregoing steps until V (n) < Th, determining TA ═ s × (n-1) × Th + s × V (n).
Further, the terminal device sends the (i +1) th random access request signal with a timing advance of
Figure BDA0002406699810000041
Further, when v (n) < Th, the terminal device takes TA as s × (n-1) × Th + s × v (n) as the timing advance of the random access request signal.
An embodiment of the present application further provides a terminal device, including: the terminal device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps of the method of any one embodiment of the application which can be used for the terminal device when being executed by the processor.
In a fourth aspect, the present application also proposes a computer-readable medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to any one of the embodiments of the present application.
In a fifth aspect, the present application further provides a mobile communication system, which includes at least 1 embodiment of any terminal device in the present application and/or at least 1 embodiment of any network device in the present application.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
in the 3GPP NR standard, the maximum TA value indicated by the random access response is different under different subcarrier spacing conditions, for example, the subcarrier spacing is in the range of 15kHz to 240kHz, and the corresponding maximum distance compensation range is 18.75 km to 300 km. In a non-ground communication system, because the distance between a base station and a terminal is long, the real timing advance TA of the terminal is far larger than the TA range which can be indicated by the base station.
The radius of the cell to the non-terrestrial communication NTN is larger, and the scheme of the application is particularly suitable for the initial random access process.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of an embodiment of the method of the present application;
FIG. 2 is a flow chart of an embodiment of the method of the present application for a network device;
FIG. 3 is a flowchart of an embodiment of a method of the present application for a terminal device;
FIG. 4 is a flow chart of another embodiment of the method of the present application for a terminal device;
FIG. 5 is a schematic diagram of an embodiment of a network device;
FIG. 6 is a schematic diagram of an embodiment of a terminal device;
fig. 7 is a schematic structural diagram of a network device according to another embodiment of the present invention;
fig. 8 is a block diagram of a terminal device of another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
FIG. 1 is a flowchart of an embodiment of the method of the present application, including steps 101-103.
Step 101, sending an ith random access request signal by using a PRACH resource;
the terminal equipment sends a random access request, and the network equipment (base station) receives the random access request and sends a random access response. With the prior art, the network device can measure the bidirectional time delay between 1 or more terminal devices and the base station according to the characteristics of the received random access request signal, thereby obtaining the value of the estimated uplink Timing Advance (TA).
102, when TA is larger than or equal to s × i × Th, the ith random access response contains information indicating the Th value, and then the (i +1) Th random access request signal is sent;
similarly, when TA ≧ s × (i +1) × Th, then the i +1 Th random access response contains information indicating the Th value, then the i +2 Th random access request signal … … is sent
Wherein TA is an uplink timing advance target value; th is a threshold value; s is a coefficient preset and/or configured at a higher layer, and may be referred to as an extension parameter.
i, i +1 ∈ [1, N ], represents an integer in the range of 1 to N for both i and i + 1.
In this application, a maximum value that can be indicated by dedicated indication information (e.g., 3GPP NR standard) of the timing advance in RAR signaling is referred to as a threshold value.
In this application, the value of the random access response indication is referred to as a signaling value. That is, the information for indicating the signaling value may be, for example, dedicated indication information in the related art 3GPP NR standard. Therefore, the maximum value of the signaling value is the threshold value. That is, the threshold value is the maximum value of the TA that the base station can directly indicate.
In this application, the value of the ith random access response indicator is referred to as the ith signaling value.
In the embodiment, optionally, the extended parameter s is 1, and in this case, the value of s may be default or configured.
In an embodiment, optionally, the extension parameter s >1, the extension parameter s being pre-configured and/or base station configured to the terminal.
When s is the default in the solution of the present application, then this step 102 can be denoted as the following step 102A.
102A, when TA is larger than or equal to i × Th, the ith random access response contains information indicating the Th value, and then the (i +1) Th random access request signal is sent;
similarly, when TA ≧ i +1) × Th, then the i +1 Th random access response contains information indicating the Th value, then the i +2 Th random access request signal … … is sent
103, repeating the step 102 until TA < s × n × Th, wherein the random access response contains information indicating TA/s- (n-1) × Th value;
wherein N ∈ [1, N ] represents an integer in the range of 1 to N.
When the extended parameter s is the default in the solution of the present application, then step 103 can be represented as the following step 103A.
Step 103A, repeat step 102A until TA < n × Th, the random access response contains information indicating the value of TA- (n-1) × Th.
It should be noted that when the extended parameter s is lacked, s in any step of the present application is default, and the expression after s is default is not described in detail below.
Preferably, in steps 101 to 103, N types of PRACH resources are defined, and an ith random access request signal is carried by an ith PRACH resource. When the method of the application is used for a network device (such as a base station) and a terminal device, the PRACH resource is used for carrying a random access request signal and/or a random access response signal.
The N-type PRACH resources may be agreed by a protocol and recorded in data of the base station and the terminal device.
The PRACH resources may be defined by a random access preamble sequence (preamble) code, and random access time and frequency resources.
The PRACH resources may be classified according to at least 1 of a preamble sequence code, a time resource, and a frequency resource.
For example, when the PRACH resources are classified according to preamble sequence codes, there are 64 preamble sequence codes that can be used, and the preamble sequence codes are classified into 8 classes, each of which includes 8 sequences. When any sequence is used, it can be known to be an nth type PRACH resource.
For another example, the PRACH resources are classified according to time resources. Different time units (or time slots, time slot combinations) are classified into N classes, and the time units occupy the same frequency resource.
For another example, the PRACH resources are classified according to frequency resources. Different frequency bins (e.g., frequency bands, or combinations of frequency bands) are classified into N classes, and the frequency bins occupy the same time resource.
In the embodiment of the present application, the PRACH resources may also be classified according to a combination of at least 2 kinds of information in a preamble sequence code, a time resource, and a frequency resource.
For example, the PRACH resources are classified by a combination of time and frequency resources. The time domain and the frequency domain are divided into N types of spaces, and each type 1 space occupies a certain time range and frequency range.
For another example, the PRACH resources are classified according to a combination of a preamble sequence code, a time resource, and a frequency resource. When the time domain and the frequency domain are divided into a plurality of time-frequency domain spaces, and the preamble sequence codes are divided into a plurality of groups, each 1 time-frequency domain space also corresponds to 1 or more groups of preamble sequence codes, or each 1 group of preamble codes corresponds to 1 or more time-frequency domain spaces.
N in this application is a positive integer without limitation, and represents the maximum number of uplink access responses (or the actual number of resource classes) that can satisfy the requirement. Optimally, it can be considered as the ratio (TA) of not less than the maximum time difference and the threshold value, the extended parametermaxTh/s). For example, when the maximum time difference according to the non-terrestrial communication is 10.3ms and the threshold value is 1ms, the extended parameter s may be 1, and N may be 11.
In the present application, s is a positive integer without limiting the range, and is used to expand the range of timing advance values represented by the signaling value. s may be considered to be no greater than a maximum time difference and Threshold (TA)maxTh) ratio. For example, when the maximum time difference of the non-terrestrial communication is 10.3ms, and the threshold value is 1ms, the maximum spreading parameter s may be 10, and at this time, TA transmission may be completed through 2 random access responses. When s is larger, although TA transmission can be completed by 1 random access response, when s is larger, transmission accuracy of a smaller TA value is degraded. By default, s ═ 1; most preferably, s is in the range of 2 to 5. According to the method shown in FIG. 1, e.g. terminal and baseThe distance of the station is 300km, when the subcarrier spacing is 30kHz, the radius of a cell which can be supported by the random access response is 150km, and according to the method, the terminal can transmit the preamble sequence and receive the random access response for many times.
Fig. 2 is a flowchart of an embodiment of a method of the present application for a network device.
It should be noted that, in the non-terrestrial mobile communication system, if the terminal knows its own position and ephemeris of the base station, it is possible to estimate the distance to the satellite. That is, the terminal has positioning capability and knows the ephemeris of the base station, so that the uplink timing advance of the terminal side can be enhanced.
However, in some cases, the positioning function of the terminal may have some lack of accuracy, such as: the accuracy of terminal positioning is lost; the third-party equipment manages the GNSS to have faults; the GNSS signals have become stuck or are fraudulent. In all these scenarios, the problem of insufficient TA accuracy arises, in which case the source of the problem needs to be identified by the network device; the TA auto-acquisition and correction functions are "disabled" at the terminal side.
The network equipment work flow provided by the application comprises the following steps:
step 201, receiving an ith random access request signal;
the network device receives the random access request.
Step 202, determining a TA value according to the characteristics of the random access request signal;
the network device measures the one-way time delay between 1 or more terminal devices and the network device, and can obtain the target value TA of the uplink timing advance according to the 1 st random access request sent by the terminal device.
Step 203, if TA ≧ s × i × Th, determining V (i) as Th, and sending the ith random access response including information for indicating the value of V (i), wherein V (i) represents the signaling value in the ith random access response.
It should be noted that, if the timing advance changes when the terminal device sends the ith random access request, the network device may further obtain an uplink timing advance target change value TA (i) according to the ith random access request sent by the terminal device, at this time, step 203 may be simplified to 203A:
step 203A,
If TA*(i) At least s × Th, determining V (i) as Th, and sending the ith random access response;
if TA*(i)<s × Th, determining V (i) as TA/s, and sending the ith random access response.
And step 204, if TA < s × (i +1) × Th, determining that V (i +1) is TA/s-i × Th, and sending an i +1 Th random access response containing information for indicating a V (i +1) value.
It should be noted that, if the timing advance changes when the terminal device sends the (i +1) th random access request, the network device may also obtain the target change value TA of the uplink timing advance according to the (i +1) th random access request sent by the terminal device*(i +1), in this case, step 204 can be simplified to 204A:
step 204A, if TA*(i+1)<s × Th, determining V (i +1) as TA/s, and sending the (i +1) Th random access response.
FIG. 3 is a flowchart of an embodiment of a method of the present application for a terminal device;
the method is used for terminal equipment and comprises the following steps of 301-305:
step 301, sending an ith random access request signal;
and the terminal equipment sends the random access request. For example, a signal indicating a random access request is transmitted on the i-th PRACH resource.
Step 302, receiving the ith random access response and information used for indicating the value of V (i);
for example, a random access response of the i-th type PRACH resource and information therein indicating a signaling value are received.
The terminal device obtains the signaling value V (i).
Step 303, when v (i) < Th, determining TA ═ s × (i-1) × Th + s × v (i);
where v (i) denotes a signaling value in the ith random access response.
The method is used for the terminal equipment and further comprises the following steps:
step 304, when V (i) -Th, transmitting a (i +1) -Th random access request signal, receiving an (i +1) -Th random access response and information indicating a value of V (i +1) therein, repeating the foregoing steps until V (n) -Th, and determining TA-s × (n-1) × Th + s × V (n).
And 305, taking TA as the timing advance of the uplink channel signal.
The uplink channel signal comprises a signal of an uplink data channel and/or an uplink control channel.
When the terminal is out of step or is accessed again, the access request is initiated again, and TA is taken as the timing advance of the random access request signal.
For example, after receiving v (i) < Th, TA is s × (i-1) × Th + s × v (n) is used as the timing advance of the random access request signal.
For another example, after receiving v (n) < Th, TA is s × (n-1) × Th + s × v (n) is used as the timing advance of the random access request signal.
For example, the terminal device receives the random access response corresponding to the nth type of random access resource, obtains an effective signaling value v (n), and after v (n) < Th is determined, the terminal learns the target value of the timing advance determined by the base station, so as to adjust the timing of the uplink channel.
With reference to steps 201 to 204 and 301 to 305, the terminal receives the value of the extended parameter s sent by the base station, sends a random access response signal for the ith time, and if the TA value indicated by the received random access response is equal to the threshold, continues to initiate the (i +1) Th random access response until the signaling value of the received nth random access response is smaller than the threshold, and the terminal takes TA as s × (n-1) × Th + s × v (n) as the uplink timing advance amount.
Examples are: the distance between the terminal and the base station is 300km, and when the subcarrier spacing is 30kHz, the radius of a cell which can be supported by the random access response is 150km, so the terminal needs to transmit preamble and receive the random access response for many times.
The terminal is an edge user, firstly, the value of an extended parameter s indicated to the terminal by the base station is 2, 1 st random access is initiated, the base station estimates the TA after receiving a random access sequence, if the TA (for example, 3.8ms) to be indicated is greater than s times of a maximum Th (for example, 2ms after being multiplied by the extended parameter) which can be indicated by a random access response, the TA is directly indicated for 1ms, the terminal performs 2 nd random access after receiving the random response, the base station estimates the TA again after receiving the random access sequence, divides the TA (for example, 3.8ms) to be indicated by the s parameter to obtain 1.9ms, subtracts the signaling value (for example, 1ms) which has been sent out to obtain a signaling value to be indicated for 0.9ms, indicates to the terminal through the random access response, and after detecting that the indicated signaling value is less than a threshold value, adds the signaling values of the two times of the indicated signaling value and multiplies the extended parameter s, namely, 1+0.9 ms is × 2, and a value (for example, 3.8ms) of the sending timing advance is obtained.
When the ith type of PRACH resource is used to carry the ith random access request signal, in conjunction with steps 201 to 204, 301 to 305, the terminal receives the value of an extended parameter s sent by the base station, initiates the ith random access on the ith type of resource, if the signaling value indicated by the received random access response is equal to the threshold value, continues to initiate the random access response on the random access resource until the signaling value of the received nth random access response is less than the threshold value, and the terminal uses TA as s × (n-1) × Th + s × v (n) as the uplink timing advance.
If the base station receives the ith random access sequence, the estimated target value TA value of the timing advance is larger than i × s × Th, and the threshold value Th is the maximum signaling value which can be indicated in one random access response, then the Th value is indicated in the ith random access response, if the base station receives the random access request in the ith random access resource, and if the TA/s is larger than (i-1) × Th and smaller than i × Th, the TA/s- (i-1) × Th is indicated in the ith random access response.
Examples are: the distance between the terminal and the base station is 300km, and when the subcarrier spacing is 30kHz, the radius of a cell which can be supported by the random access response is 150km, so the terminal needs to transmit preamble and receive the random access response for many times.
The method comprises the steps that a terminal is an edge user, firstly, an s value of an extension parameter indicated to the terminal by a base station is received to be 2, random access resources are selected from a 1 st type random access resource set to initiate 1 st random access, the base station estimates the TA after receiving a random access sequence, if the TA (such as 3.8ms) needing to be indicated is larger than s times of the maximum Th (such as 30kHz subcarrier interval, the maximum value of the indicated TA is 1ms and is 2ms after being multiplied by the extension parameter), the TA is directly indicated for 1ms, the terminal selects the random access resources from a 2 nd type random access resource set to initiate 2 nd random access after receiving the random access response, the base station estimates the TA again after receiving the random access sequence, the TA (such as 3.8ms) needing to be indicated is divided by the s parameter to obtain 1.9ms, the sent signaling value (such as 1ms) is subtracted, the signaling value needing to be indicated is obtained to be 0.9ms, the signaling value needing to be indicated is indicated to the terminal through the random access response, the signaling value is detected to be smaller than a threshold value, the signaling value which is multiplied by the extension parameter (such as 358 ms), and the timing value is obtained by adding the extension parameter (such as 358.25 ms).
FIG. 4 is a flow chart of another embodiment of the method of the present application for a terminal device;
the method is used for the terminal equipment and comprises the following steps:
step 401, sending an ith random access request signal;
and the terminal equipment sends the random access request. For example, a signal indicating a random access request is transmitted on the i-th PRACH resource
Step 402, receiving an ith random access response and information used for indicating a value of V (i) in the ith random access response;
for example, receiving a random access response of PRACH resource of type i and information therein indicating a signaling value, the terminal device obtains the signaling value v (i).
In step 403, when v (i) < Th, TA ═ s × (i-1) × Th + s × v (i) is determined, and the process proceeds to step 406.
Where v (i) denotes a signaling value in the ith random access response.
Step 404, when v (i) is Th, transmitting the i +1 Th random access request signal according to the timing advance TA',
Figure BDA0002406699810000121
receiving a random access response of the i +1 th type PRACH resource and information used for indicating a V (i +1) value;
it should be noted that the difference between the timing advance TA' and the timing advance target value TA at this time can be evaluated according to the signal characteristic of the random access request of the (i +1) th time, that is, the timing advance target adjustment value TA, when the network device receives the random access request of the (i +1) th time*。
Step 405, repeat step 404 until v (n) < Th, determine TA ═ s × (n-1) × Th + s × v (n).
And step 406, taking the TA as the timing advance of the uplink channel signal.
The uplink channel signal comprises a signal of an uplink data channel and/or an uplink control channel.
When the terminal is out of step or is accessed again, the access request is initiated again, and TA is taken as the timing advance of the random access request signal.
For example, the terminal device receives the random access response corresponding to the nth type of random access resource, obtains an effective signaling value v (n), and after v (n) < Th is determined, the terminal learns the target value of the timing advance determined by the base station, so as to adjust the timing of the uplink channel.
Combining steps 201-202, 203A-204A, 401-406, the terminal receives the value of the extended parameter s sent by the base station, initiates the ith random access, if the value of the received random access response indication is equal to the threshold value, the rootAccording to the received random access response information, firstly adjusting the timing advance of the (i +1) Th random access signal, increasing the timing advance by s × Th, continuing to initiate the (i +1) Th random access until the signaling value of the received nth random access response is less than a threshold value, taking TA (s × (n-1) × Th + s × V (n)) as the uplink timing advance by the terminal, and if the base station receives the ith random access request, estimating the target change value TA of the uplink timing advance*(i) If it is greater than s × Th, the threshold value is the maximum signaling value which can be indicated in one random access response, so indicating Th value in the ith random access response, if the base station receives the ith random access request, the estimated TA*(i) Less than s × i × Th, TA is indicated in the ith random access response*(i)/s。
Examples are: the distance between the terminal and the base station is 300km, and when the subcarrier spacing is 30kHz, the radius of a cell which can be supported by the random access response is 150km, so the terminal needs to send a preamble sequence and receive the random access response for many times.
A terminal is an edge user, firstly receiving an extension parameter s indicated to the terminal by a base station to be 2, initiating a first random access, after receiving a random access sequence, the base station estimates a timing advance, if an obtained target value (for example, 3.8ms) of the timing advance is larger than s times of the maximum range which can be indicated by a primary random access response (for example, 30kHz subcarrier interval, the maximum value indicated by the primary response is 1ms), then directly indicating a signaling value of 1ms, after receiving the random response, the terminal adjusts an uplink timing advance for sending a 2 nd random access signal to be s × Th (namely, 2ms), then performing a 2 nd random access, after receiving the 2 nd random access sequence, the base station estimates the timing advance again, and an estimated target change value TA of the uplink timing advance is estimated*(2) For example, 1.8ms, the value obtained by dividing by the parameter s is 0.9ms smaller than the threshold value as the signaling value, and if the terminal detects that the indicated signaling value is smaller than the threshold, the signaling values indicated twice are added and then multiplied by the extension parameter s, that is, (1+0.9) × 2, so as to obtain the final sending timing advance value (for example, 3.8 ms).
When the ith random access request signal is carried by using the ith PRACH resource, in combination with steps 201 to 204 and 401 to 406, the terminal receives a numerical value of an extended parameter s sent by the base station, selects a random access resource in the ith random access set to initiate the ith random access, if a signaling value indicated by a received random access response is equal to a threshold value, firstly adjusts a timing advance of the (i +1) Th random access signal according to the received random access response information, increases the timing advance by s × Th, continues to select the random access resource in the (i +1) Th random access set to initiate the (i +1) Th random access until the signaling value of the received nth random access response is less than the threshold value, and takes TA s × (n-1) × Th + s × V (n) as an uplink timing advance.
If the base station receives the random access request in the i-type random access resource, the estimated uplink timing advance target value is larger than i × s × Th, and the threshold value is the maximum signaling value which can be indicated in one random access response, then the Th value is indicated in the ith random access response, and if the base station receives the random access request in the i-type random access resource, the uplink timing advance target value TA is larger than s × (i-1) × Th and smaller than s × i × Th, then TA/s- (i-1) × Th is indicated in the ith random access response.
Examples are: the distance between the terminal and the base station is 300km, and when the subcarrier spacing is 30kHz, the radius of a cell which can be supported by the random access response is 150km, so the terminal needs to send a preamble sequence and receive the random access response for many times.
The terminal is an edge user, first, an extended parameter s indicated to the terminal by the base station is received to be 2, the random access resource is selected from a first type of random access resource set to initiate first random access, after the base station receives a random access sequence, the timing advance is estimated, if a TA (e.g. 3.8ms) to be indicated is greater than s times of a maximum range which can be indicated by a random access response (e.g. 30kHz subcarrier interval, the maximum value indicated by a primary response is 1ms), a signaling value is directly indicated for 1ms, after the terminal receives the random response, the uplink timing advance for transmitting a 2 nd random access signal is adjusted to be TA' ═ s 85th (i.e. 2ms), then the random access resource is selected from a 2 nd type of random access resource set to perform 2 nd random access, after the base station receives the random access sequence, the uplink timing advance target value TA is removed from the uplink timing advance for 2ms which has been adjusted by a 2 nd random access signal, a difference value (e.g. 1.8ms) is divided by the s parameter to obtain a signaling value which is smaller than a threshold value, and the signaling value is obtained by adding the extended parameter s + 3.84, which is obtained by adding the signaling value (e.g. 2 ms).
Fig. 5 is a schematic diagram of an embodiment of a network device.
The embodiment of the application also provides network equipment, and by using the method of any one of the embodiments of the application, the network equipment is used for receiving the ith random access request signal, determining a TA value according to the characteristics of the random access request signal, determining V (i) to be Th if the TA is more than or equal to s × i × Th, and sending the ith random access response containing information for indicating the value of V (i), wherein V (i) represents a signaling value in the ith random access response.
Further, the network device is further configured to, if TA < s × (i +1) × Th, determine that V (i +1) is TA/s-i × Th, transmit an i +1 Th random access response including information indicating a V (i +1) value.
In order to implement the foregoing technical solution, the network device 400 provided in the present application includes a network sending module 401, a network determining module 402, and a network receiving module 403. And the network sending module is used for generating information indicating the signaling value and sending the random access response. The network determining module is configured to determine the uplink timing advance target value or the uplink timing advance target modification value, and calculate a signaling value. The network receiving module is used for receiving a random access request. The network receiving module is further configured to receive a signaling configuration (e.g., a semi-static configuration signaling RRC), and obtain a value s (s may be configured to be 1 or other values; when s is absent, the network device does not configure the s parameter). Further, the network receiving module is further configured to receive an uplink data channel or an uplink control channel signal. Further, the network receiving module is further configured to receive a PRACH resource classification configured by a high-level signaling.
The specific method for implementing the functions of the network sending module, the network determining module, and the network receiving module is described in the embodiments of the methods shown in fig. 1 to 4, and will not be described herein again.
Fig. 6 is a schematic diagram of an embodiment of a terminal device.
The present application further provides a terminal device, which uses the method of any one of the embodiments of the present application, and is configured to:
sending an ith random access request signal;
and when V (i +1) < Th, determining that TA is s × (i-1) × Th + s × V (i +1), wherein V (i) represents a signaling value in the ith random access response.
Further, the terminal device is further configured to transmit an i +1 Th random access request signal when V (i) ═ Th, receive an i +1 Th random access response and information indicating a V (i +1) value therein, repeat the foregoing steps until V (n) < Th, and determine TA ═ s × (n-1) × Th + s × V (n).
Further, the terminal equipment advances by timing
Figure BDA0002406699810000161
And transmitting the (i +1) th random access request signal.
Further, the terminal device uses TA as the timing advance of the random access request signal.
In order to implement the foregoing technical solution, the terminal device 500 provided in the present application includes a terminal sending module 501, a terminal determining module 502, and a terminal receiving module 503. The terminal receiving module is used for receiving the random access response and the information of the identification indication signaling value; further, the terminal receiving module is further configured to receive the signaling configuration (e.g., semi-static configuration signaling RRC), and obtain the s value (s may be configured to be 1 or another value; when s is absent, the terminal device does not configure the s parameter). Further, the terminal receiving module is further configured to receive a PRACH resource classification configured by a high-level signaling or a dynamic signaling. The terminal determining module is used for determining the terminal,for calculating timing advance
Figure BDA0002406699810000162
Or an uplink timing advance target value TA. And the terminal sending module is used for sending the random access request. The terminal sending module is further configured to send an uplink data channel or an uplink control channel signal according to the timing advance or the uplink timing advance target value.
The specific method for implementing the functions of the terminal sending module, the terminal determining module and the terminal receiving module is described in the embodiments of the methods shown in fig. 1 to 4 of the present application, and is not described herein again.
The specific method for implementing the functions of the terminal sending module, the terminal determining module and the terminal receiving module is described in the embodiments of the methods shown in fig. 1 to 4 of the present application, and is not described herein again.
The terminal equipment can be mobile terminal equipment.
Based on the embodiments of fig. 5 to 6, the present application further provides a mobile communication system, which includes at least 1 embodiment of any terminal device in the present application and/or at least 1 embodiment of any network device in the present application.
Fig. 7 is a schematic structural diagram of a network device according to another embodiment of the present invention. As shown in fig. 7, the network device 600 includes a processor 601, a wireless interface 602, and a memory 603. Wherein the wireless interface may be a plurality of components, i.e. including a transmitter and a receiver, providing means for communicating with various other apparatus over a transmission medium. The wireless interface implements a communication function with the terminal device, and processes wireless signals through the receiving and transmitting devices, and data carried by the signals are communicated with the memory or the processor through the internal bus structure. The memory 603 contains a computer program for executing any of the embodiments of fig. 1 to 3 of the present application, which is run or changed on the processor 601. When the memory, processor, wireless interface circuit are connected through a bus system. The bus system includes a data bus, a power bus, a control bus, and a status signal bus, which are not described herein.
Fig. 8 is a block diagram of a terminal device of another embodiment of the present invention. The terminal device 700 shown in fig. 8 comprises at least one processor 701, a memory 702, a user interface 703 and at least one network interface 704. The various components in the terminal device 700 are coupled together by a bus system. A bus system is used to enable connection communication between these components. The bus system includes a data bus, a power bus, a control bus, and a status signal bus.
The user interface 703 may include a display, a keyboard, or a pointing device, such as a mouse, a trackball, a touch pad, or a touch screen, among others.
The memory 702 stores executable modules or data structures. The memory may have stored therein an operating system and an application program. The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application programs include various application programs such as a media player, a browser, and the like for implementing various application services.
In the embodiment of the present invention, the memory 702 contains a computer program for executing any one of the embodiments of fig. 1 to 3 of the present application, and the computer program runs or changes on the processor 701.
The memory 702 contains a computer readable storage medium, and the processor 701 reads the information in the memory 702 and combines the hardware to complete the steps of the above-described method. In particular, the computer-readable storage medium has stored thereon a computer program, which when executed by the processor 701 implements the steps of the method embodiment as described above with reference to any one of the embodiments of fig. 1 to 4.
The processor 701 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the method of the present application may be implemented by hardware integrated logic circuits in the processor 701 or by instructions in the form of software. The processor 701 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, an off-the-shelf programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor.
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 an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. In a typical configuration, the device of the present application includes one or more processors (CPUs), an input/output user interface, a network interface, and a memory.
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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application therefore also proposes a computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of the embodiments of the present application. For example, the memory 603, 702 of the present invention may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM).
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (22)

1. A timing advance indicating method is characterized by comprising the following steps:
sending an ith random access request signal by using a PRACH resource;
when TA is larger than or equal to s × i × Th, the ith random access response contains information indicating the Th value, and then the (i +1) Th random access request signal is sent;
until TA < s × n × Th, the random access response contains information indicating a TA/s- (n-1) × Th value;
wherein, i, i +1, N ∈ [1, N ], TA is an uplink timing advance target value, Th is a threshold value, and s is a preset coefficient.
2. The method of claim 1, wherein by default s-1.
3. The method of claim 1, wherein s >1, s is pre-configured and/or base station configured for the terminal.
4. The method of claim 1,
and in the N types of PRACH resources, bearing the ith random access request signal by the ith type of PRACH resource.
5. The method of claim 4, wherein the PRACH resources are classified according to at least 1 of preamble sequence code, time resource, and frequency resource.
6. The method of claim 4, wherein the PRACH resources are classified according to a combination of at least 2 information of preamble sequence codes, time resources and frequency resources.
7. The method according to any of claims 1 to 6, for a network device, comprising the steps of:
receiving an ith random access request signal;
determining a TA value according to the characteristics of the random access request signal;
if TA is greater than or equal to s × i × Th, determining V (i) as Th;
transmitting an ith random access response including information indicating a value of V (i);
where v (i) denotes a signaling value in the ith random access response.
8. The method of claim 7, further comprising the step of:
if TA < s × (i +1) × Th, determining V (i +1) as TA/s-i × Th;
and transmitting the (i +1) th random access response, wherein the (i +1) th random access response contains information used for indicating the value of the V (i + 1).
9. The method according to any one of claims 1 to 6, used for a terminal device, comprising the steps of:
sending an ith random access request signal;
receiving an ith random access response and information therein indicating a value of V (i);
when v (i) < Th, TA ═ s × (i-1) × Th + s × v (i);
where v (i) denotes a signaling value in the ith random access response.
10. The method of claim 9, further comprising the step of:
transmitting an i +1 Th random access request signal when v (i) is Th;
receiving a random access response of PRACH resource of type i +1 and information therein indicating a value of V (i +1) until V (n) < Th;
TA is determined as s × (n-1) × Th + s × v (n).
11. The method of claim 9 or 10, comprising the steps of:
the timing advance for transmitting the i +1 th random access request signal is
Figure FDA0002406699800000031
12. The method of claim 10, further comprising the step of:
TA is s × (n-1) × Th + s × v (n) as the timing advance of the random access request signal.
13. A network device, the method as claimed in any one of claims 1 to 8, wherein the network device is configured to:
receiving an ith random access request signal;
determining a TA value according to the characteristics of the random access request signal;
if TA is greater than or equal to s × i × Th, determining V (i) as Th;
transmitting an ith random access response including information indicating a value of V (i);
where v (i) denotes a signaling value in the ith random access response.
14. The network device of claim 13,
if TA < s × (i +1) × Th, V (i +1) is determined to be TA/s-i × Th,
and transmitting the (i +1) th random access response, wherein the (i +1) th random access response contains information used for indicating the value of the V (i + 1).
15. A network device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of claims 1 to 8.
16. A terminal device, the method as claimed in any one of claims 1 to 6 and 9 to 12, wherein the terminal device is configured to:
sending an ith random access request signal;
receiving an ith random access response and information therein indicating a value of V (i);
when V (i +1) < Th, TA is determined to be s × (i-1) × Th + s × V (i +1),
where v (i) denotes a signaling value in the ith random access response.
17. The terminal device of claim 16,
transmitting an i +1 Th random access request signal when v (i) is Th;
receiving an i +1 Th random access response and information therein indicating a value of V (i +1) until V (n) < Th;
TA is determined as s × (n-1) × Th + s × v (n).
18. The terminal device according to claim 16 or 17,
the timing advance for transmitting the i +1 th random access request signal is
Figure FDA0002406699800000041
19. The method of claim 17, further comprising the step of:
TA is s × (n-1) × Th + s × v (n) as the timing advance of the random access request signal.
20. A terminal device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the method according to any one of claims 1 to 6, 9 to 12.
21. A mobile communication system comprising at least one network device according to any of claims 13 to 15 and at least one terminal device according to any of claims 16 to 20.
22. A computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 12.
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