CN110730465B - Method for enhancing consistency of reconfiguration resources of LTE230 system - Google Patents
Method for enhancing consistency of reconfiguration resources of LTE230 system Download PDFInfo
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- CN110730465B CN110730465B CN201810777493.8A CN201810777493A CN110730465B CN 110730465 B CN110730465 B CN 110730465B CN 201810777493 A CN201810777493 A CN 201810777493A CN 110730465 B CN110730465 B CN 110730465B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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Abstract
The invention discloses a method for enhancing the consistency of the reallocation resources of an LTE230 system, which comprises the following steps: after the eNB receives the completion of the reconfiguration of the resident sub-band and the search space, if the reconfiguration is different from the configuration of the current UE resident sub-band and the search space, the initial transmission reconfiguration activates the MAC CE; after the feedback received by the eNB is ACK, updating the current UE resident sub-band and search space configuration into the reconfigured UE resident sub-band and search space configuration; and after the UE finishes the reconfiguration of the uploaded resident sub-band and the search space, if the reconfigured configuration is different from the current configuration of the UE resident sub-band and the search space, receiving the reconfiguration activation MAC CE, and updating the current configuration of the UE resident sub-band and the search space into the configuration of the reconfigured UE resident sub-band and the search space. The invention solves the problem that the resource states of the UE and the eNB are not matched after the reconfiguration, improves the consistency of the reconfigured resources, reduces the service time delay and improves the system performance.
Description
Technical Field
The present invention relates to mobile communication technology, and in particular, to a method for enhancing consistency of reconfiguration resources of an LTE (Long Term Evolution) 230 system.
Background
Some communication related parameters are reconfigured in the reconfiguration message of the LTE system, and if the understanding of the effective time of some fields in the reconfiguration message is inconsistent between the base station side and the user terminal side, problems such as high error code, high delay, poor QoS (Quality of Service), and even terminal disconnection may be caused. It is important that the terminal and the base station are able to synchronize the relevant fields in the reconfiguration message.
In the LTE230 system, a base station configures a search space and a persistent subband of a UE through a reconfiguration message according to the signal quality of a terminal, so that the persistent subband and the search space of the UE can adaptively change along with the channel quality, thereby improving the service quality of the UE and reasonably and effectively utilizing air interface resources.
The LTE230 system reconfigures the special search space and the resident sub-band of the terminal, and the base station side takes the special search space and the resident sub-band reconfigured into effect after the reconfiguration is completed. However, the terminal side cannot sense whether the base station receives the reconfiguration completion, which may cause the situation that the terminal works in the search space after the reconfiguration or resides in the sub-band and the base station works in the search space before the reconfiguration or resides in the sub-band, thereby causing communication blocking reconfiguration failure, terminal disconnection, and serious influence on the reconfiguration success rate of the system.
At present, the common method is that the terminal side increases the search space before the reconfiguration and the working time of the resident subband so as to reserve enough time to ensure that the reconfiguration is successfully completed and sent, but the method causes larger service delay, and only reduces the probability of failure of the reconfiguration completion and sending, thereby not solving the problem fundamentally.
Disclosure of Invention
In view of this, the present invention provides a method for enhancing consistency of reconfiguration resources of an LTE230 system, so as to solve a problem that resource states of a UE and an eNB may not be matched after LTE230 reconfiguration, improve consistency of reconfiguration resources, reduce time delay of a service, and improve system performance.
The technical scheme of the invention is realized as follows:
a method for enhancing consistency of reconfiguration resources of an LTE230 system, comprising:
after a base station eNB in the LTE230 system receives the completion of the reconfiguration of the resident sub-band and the search space uploaded by a user equipment UE, if the configuration of the reconfigured UE resident sub-band and the search space is different from the configuration of the current UE resident sub-band and the search space, primarily transmitting a reconfiguration activation MAC control element (MAC CE) to the UE;
after receiving the feedback ACK of the UE, the eNB updates the current UE resident sub-band and search space configuration to the reconfigured UE resident sub-band and search space configuration;
after the UE in the LTE230 system finishes uploading the resident sub-band and search space reconfiguration, if the configuration of the resident sub-band and the search space of the reconfigured UE is different from the configuration of the resident sub-band and the search space of the current UE, waiting to receive the reconfiguration activated MAC CE, feeding back ACK (acknowledgement) to the eNB after successful reception, and then updating the configuration of the resident sub-band and the search space of the current UE to the configuration of the resident sub-band and the search space of the reconfigured UE.
Further, the UE performs ACK/NACK feedback to the eNB by adopting a hybrid automatic repeat request (HARQ) process.
Further, if the HARQ feedback received by the eNB from the UE is NACK and the maximum retransmission times of the HARQ are not reached, retransmitting the reconfiguration activation MAC CE to the UE.
Further, if the eNB receives that the HARQ feedback of the UE is NACK and the maximum retransmission times of the HARQ are reached, recording activation failure times.
Further, if the activation failure times reach a first preset time under the current UE camping subband and search space configuration, the eNB updates the current UE camping subband and search space configuration to the reconfigured UE camping subband and search space configuration, and then the eNB initially transmits the reconfigured activated MACCE to the UE again.
Further, if the activation failure times reach a second preset time under the reconfiguration of the UE resident sub-band and the search space configuration, the eNB releases the UE.
Further, the eNB initially transmits the reconfiguration activated MAC CE by using a scheduling module.
Further, the reconfiguration active MAC CE is transmitted through the logical channel ID reserved by the LTE230 system.
Further, the reconfiguration active MAC CE is 1 byte, wherein the first 3 bits of the 1 byte indicate that the current MAC is the reconfiguration active MAC CE.
Further, the HARQ process of the UE performs the ACK/NACK feedback to the eNB through a physical uplink control channel, PUCCH, of the LTE230 system.
According to the scheme, the method for enhancing the consistency of the reconfiguration resources of the LTE230 system regulates the behaviors of eNB and UE by utilizing the Logical Channel Identification (LCID) reserved by the LTE230 system and the HARQ feedback function of a PUCCH channel and by introducing the reconfiguration resources to activate MAC CE, solves the problem that the reconfiguration resources take effect by depending on the completion of reconfiguration, and effectively solves the problem of PUCCH virtual detection by sending reconfiguration activation in both a search space and a resident subband before and after the reconfiguration; the method of the invention is simple to realize, greatly improves the consistency of the reallocation resources, reduces the time delay of the service and effectively improves the system performance.
Drawings
Fig. 1 is a schematic diagram illustrating a method for enhancing consistency of reallocation resources of an LTE230 system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a byte structure of a reconfiguration active MAC CE in the embodiment of the present invention;
fig. 3 is a flowchart of the eNB side according to the embodiment of the present invention after receiving the reconfiguration completion;
fig. 4 is a flowchart of the UE side after completing the sending reconfiguration in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, a method for enhancing the consistency of the reallocation resources of the LTE230 system provided by the embodiment of the present invention mainly includes:
after an eNB (base station) in the LTE230 system receives a resident subband and a search space that are uploaded by a UE (User Equipment), if a configuration of the reconfigured UE resident subband and the search space is different from a configuration of a current UE resident subband and a search space, a Control Element (Control Element) CE (Multiple access channel) is initially reconfigured to the UE;
after receiving the feedback of the UE as ACK (Acknowledgement), the eNB updates the current UE resident sub-band and search space configuration to the reconfigured UE resident sub-band and search space configuration;
after the reconfiguration of the uplink resident sub-band and the search space by the UE in the LTE230 system is completed, if the configuration of the reconfigured UE resident sub-band and the search space is different from the configuration of the current UE resident sub-band and the search space, the UE waits for receiving the reconfiguration activation MAC CE, feeds back ACK to the eNB after successful receiving, and then updates the configuration of the current UE resident sub-band and the search space into the configuration of the reconfigured UE resident sub-band and the search space.
In a specific embodiment, the UE performs ACK/NACK feedback to the eNB by using a HARQ (Hybrid Automatic Repeat reQuest) process.
In a specific embodiment, if the eNB receives the feedback of the UE as NACK and the maximum number of retransmissions of HARQ is not reached, the eNB retransmits the reconfiguration activation MAC CE to the UE.
In one embodiment, if the eNB receives the UE's feedback as NACK and the maximum number of retransmissions of HARQ has been reached, the number of activation failures is recorded.
In a specific embodiment, if the activation failure times reach a first preset time under the current UE resident subband and search space configuration, the eNB updates the current UE resident subband and search space configuration to the reconfigured UE resident subband and search space configuration, and then initially transmits the reconfigured activation MAC CE to the UE again. In one embodiment, the first predetermined number of times is one.
In a specific embodiment, if the activation failure times reach a second preset time under the reconfiguration of the UE camping subband and the search space configuration, the eNB releases the UE. In one embodiment, the second predetermined number of times is two.
In a specific embodiment, the eNB initially reconfigures the activated MAC CE using a scheduling module.
In a particular embodiment, the reconfiguration active MAC CE is transmitted over the logical channel ID reserved by the LTE230 system.
In one embodiment, the reconfiguration active MAC CE is 1 byte, wherein the first 3 bits of the 1 byte indicate that the current MAC is the reconfiguration active MAC CE.
In a specific embodiment, the HARQ process of the UE performs ACK/NACK feedback to the eNB through a Physical Uplink Control Channel (PUCCH) of the LTE230 system.
In a specific embodiment, the UE performs ACK feedback to the eNB if it successfully decodes the PDSCH (Physical Downlink shared channel), and performs NACK feedback otherwise. The PDSCH carries MAC PDUs, the MAC PDUs may include a reconfiguration activated MAC CE (the eNB knows whether the MAC CE is included), and if the ACK feedback is received and the MAC PDU is sent to include the MAC CE, the eNB knows that the activation is successful, otherwise, the activation fails.
For reconfiguring an active MAC CE, see the structure shown in fig. 2. In one embodiment, the fixed length of the reconfiguration active MAC CE is 1 byte, and the byte meaning is defined as follows:
LCID (local channel identity): the first 3 bits of this byte, set to "100" indicates that the current MAC header is a reconfiguration active MAC CE.
R: reserved bit, set to 1.
The eNB side procedure and the UE side procedure are described below.
For convenience of describing the base station side flow, the following variables are defined:
UeRes: camping subband and search space configuration for UE
CurUeRes: the structure of the camping subband and the search space configuration currently used by the UE is defined by UeRes.
ActFailNum: and activating failure times, performing first activation on the resident subband and the search space before reconfiguration, and performing second activation on the reconfigured search space if the first activation is failed, so as to prevent the false detection of the PUCCH and determine ACK false detection as NACK.
The starting procedure of the eNB after receiving the reconfiguration completion is shown in fig. 3, and includes the following steps.
Starting, the eNB starts the following processing flow after receiving the reconfiguration completion:
step a1, judging whether a reconfigured resident sub-band and a search space (UeRes) are consistent with a resident sub-band and a search space (CurUeRes) used by the current UE, if so, activating and finishing, otherwise, entering step a2;
step a2, setting the activation failure times (ActFailNum) to be 0, and then entering step a3;
step a3, the scheduling module initially reallocates and activates the MAC CE: the scheduling module selects an idle HARQ process, and sends the MAC CE in the current resident sub-band and the search space, and the specific implementation of different manufacturers is different, so that the detailed description is omitted here, and then the step a4 is carried out;
step a4, judging whether the feedback received by the HARQ process is ACK, if so, entering step a5, otherwise (the feedback is NACK) entering step a6;
step a5, updating the resident subband and the search space (CurUeRes) currently used by the UE to be the resident subband and the search space (UeRes) in reconfiguration, and then ending;
step a6, judging whether the HARQ process reaches the maximum retransmission times, if not, entering a step a7, otherwise, entering a step a8;
step a7, the scheduling module retransmits and reconfigures the activated MAC CE: the scheduling module retransmits the MAC CE on the current resident sub-band and the search space by using the current HARQ process to be retransmitted, and the specific implementation of different manufacturers is different, so that the detailed description is omitted here, and then the step a4 is carried out;
step a8, adding 1 to the activation failure times, namely ActFailNum +1: indicating that the UE fails to activate reconfiguration in the current search space, and then entering a step a9;
step a9, judging whether the activation failure times is more than 1, if ActFailNum is more than 1, entering step a11, otherwise entering step a10;
step a10, updating a resident sub-band and a search space (CurUeRes) currently used by the UE to be a resident sub-band and a search space (UeRes) in reconfiguration, and then returning to step a3, in order to prevent false detection (ACK detection is NACK) of feedback by a base band, retransmitting reconfiguration activation under new configuration so as to increase the probability of reconfiguration activation;
step a11, informing the high layer to release the UE: the reconfiguration cannot be activated in the old configuration and the new configuration for a plurality of times of attempts, which indicates that the link has problems, and the air interface resources can be effectively saved by releasing the UE.
The starting procedure of the UE after the sending reconfiguration is completed is shown in fig. 4, and includes the following steps.
Step b1, judging whether the reconfigured resident sub-band and the search space (UeRes) are consistent with the resident sub-band and the search space (CurUeRes) used by the current UE, if so, ending the process without waiting for reconfiguration activation, otherwise, entering step b2;
step b2, waiting for the reconfiguration of the activated MAC CE: the UE blindly detects the PDCCH in the current resident sub-band and the search space, and enters a step b3;
step b3, judging whether a reconfiguration activation MAC CE is received, if the UE receives downlink authorization and a Protocol Data Unit (MAC PDU) carried in a PDSCH indicated by the downlink authorization contains the reconfiguration activation MAC CE, entering step b4, otherwise, entering step b2;
and b4, updating the resident subband and the search space (CurUeRes) currently used by the UE to the resident subband and the search space (UeRes) in reconfiguration, and then ending the process.
According to the method for enhancing the consistency of the reconfiguration resources of the LTE230 system, the reserved Logical Channel Identifier (LCID) of the LTE230 system and the HARQ feedback function of the PUCCH are utilized, the MAC CE is activated by introducing the reconfiguration resources, the behaviors of the eNB and the UE are specified, the problem that the reconfiguration resources are brought into effect by depending on the completion of reconfiguration is solved, the reconfiguration activation is sent in the search space and the resident sub-band before and after the reconfiguration, and the problem of virtual detection of the PUCCH is effectively solved; the method of the invention is simple to realize, greatly improves the consistency of the reallocation resources, reduces the time delay of the service and effectively improves the system performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for enhancing consistency of reconfiguration resources of an LTE230 system, comprising:
after a base station eNB in the LTE230 system receives the completion of the reconfiguration of the resident sub-band and the search space uploaded by User Equipment (UE), if the configuration of the reconfigured UE resident sub-band and the search space is different from the configuration of the current UE resident sub-band and the search space, initially reconfiguring and activating an MAC control element (MAC CE) to the UE;
after receiving the feedback ACK of the UE, the eNB updates the current UE resident sub-band and search space configuration to the reconfigured UE resident sub-band and search space configuration;
after the UE in the LTE230 system finishes uploading the resident sub-band and search space reconfiguration, if the configuration of the resident sub-band and the search space of the reconfigured UE is different from the configuration of the resident sub-band and the search space of the current UE, waiting to receive the reconfiguration activated MAC CE, feeding back ACK (acknowledgement) to the eNB after successful reception, and then updating the configuration of the resident sub-band and the search space of the current UE to the configuration of the resident sub-band and the search space of the reconfigured UE.
2. The method of claim 1, wherein the method comprises:
and the UE adopts a hybrid automatic repeat request (HARQ) process to perform ACK/NACK feedback to the eNB.
3. The method of claim 2 for enhancing consistency of re-allocated resources of an LTE230 system, wherein:
and if the HARQ feedback received by the eNB from the UE is NACK and the maximum retransmission times of the HARQ are not reached, retransmitting the reconfiguration activation MAC CE to the UE.
4. The method of claim 3, wherein the method comprises:
and if the HARQ feedback received by the eNB from the UE is NACK and the maximum retransmission times of the HARQ are reached, recording the activation failure times.
5. The method of claim 4, wherein the method comprises:
and if the activation failure times reach first preset times under the current UE resident sub-band and search space configuration, the eNB updates the current UE resident sub-band and search space configuration to the reconfigured UE resident sub-band and search space configuration, and then the eNB primarily transmits the reconfigured activation MAC CE to the UE again.
6. The method of claim 5, wherein the method comprises:
and if the activation failure times reach a second preset time under the reconfiguration UE resident sub-band and the search space configuration, the eNB releases the UE.
7. The method of claim 1, wherein the method comprises:
and the eNB primarily transmits the reconfiguration activated MAC CE by using a scheduling module.
8. The method of claim 1 for enhancing consistency of re-allocated resources of an LTE230 system, wherein:
the reconfiguration activation MAC CE is transmitted through the logical channel ID reserved by the LTE230 system.
9. The method of claim 8, wherein the method comprises:
the reconfiguration active MAC CE is 1 byte, wherein the first 3 bits of the 1 byte indicate that the current MAC is the reconfiguration active MAC CE.
10. The method of claim 2, wherein the method comprises the following steps:
the HARQ process of the UE performs the ACK/NACK feedback to the eNB through a Physical Uplink Control Channel (PUCCH) of the LTE230 system.
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