CN110730465B - Method for enhancing consistency of reconfiguration resources of LTE230 system - Google Patents

Abstract

The present invention discloses a method for enhancing the consistency of reconfiguration resources in an LTE230 system, which includes: after the eNB receives the resident subband and search space reconfiguration, if the reconfigured is the same as the current UE resident subband and search space If the space configuration is different, the initial transmission reconfiguration activates the MAC CE; after the eNB receives the feedback as ACK, it updates the current UE resident subband and search space configuration to the reconfigured UE resident subband and search space configuration; UE is uploading After the reconfiguration of the resident subband and search space is completed, if the reconfiguration is different from the current UE resident subband and search space configuration, the MAC CE will be activated by receiving the reconfiguration, and the current UE resident subband and search space configuration will be updated For reconfiguration UE reside subband and search space configuration. The present invention solves the problem of resource status mismatch between UE and eNB after reconfiguration, improves the consistency of reconfiguration resources, reduces service time delay, and improves system performance.

Description

A method for enhancing consistency of reconfiguration resources in LTE230 system

technical field

The present invention relates to mobile communication technology, in particular to a method for enhancing consistency of reconfiguration resources of LTE (Long Term Evolution, long term evolution) 230 system.

Background technique

Some communication-related parameters will be reconfigured in the reconfiguration message of the LTE system. If the base station side and the user terminal side have different understandings of the effective time of some fields in the reconfiguration message, it may cause high bit errors, high delays, and QoS ( Quality of Service, poor quality of service, or even terminal disconnection. It can be seen that it is very important for the terminal and the base station to enable the relevant fields in the reconfiguration message to take effect synchronously.

In the LTE230 system, the base station configures the UE's search space and resident subbands through reconfiguration messages according to the signal quality of the terminal, so that the UE's resident subbands and search spaces can be adaptively changed with the channel quality, thereby improving the UE's performance. Quality of service and reasonable and effective use of air interface resources.

The LTE230 system configures the dedicated search space and resident subband of the terminal through reconfiguration, and the base station side receives the completion of the reconfiguration, and the reconfigured dedicated search space and resident subband take effect. However, the terminal side cannot perceive whether the base station has received the completion of reconfiguration, which may cause the terminal to work in the search space or resident subband after reconfiguration and the base station to work in the search space or resident subband before reconfiguration, thereby hindering communication The reconfiguration fails and the terminal goes offline, seriously affecting the reconfiguration success rate of the system.

At present, the usual practice is to increase the search space before reconfiguration and the working time of the resident subband on the terminal side, so as to reserve enough time to ensure that the reconfiguration is completed and the transmission is successful, but this method will cause a large service delay. , and only reducing the probability of reconfiguration completion sending failure does not fundamentally solve the problem.

Contents of the invention

In view of this, the present invention provides a method for enhancing the consistency of reconfiguration resources of the LTE230 system, to solve the problem that the resource states of UE and eNB may not match after LTE230 reconfiguration, improve the consistency of reconfiguration resources, and reduce service time. delay, improving system performance.

Technical scheme of the present invention is realized like this:

A method for enhancing consistency of reconfiguration resources of an LTE230 system, comprising:

After the base station eNB in the LTE230 system receives the resident subband and search space reconfiguration uploaded by the user terminal UE, if the configuration of the reconfigured UE resident subband and search space is consistent with the current UE resident subband and search space If the configurations are different, the initial reconfiguration activation MAC control element (MAC CE) is transmitted to the UE;

After receiving the feedback from the UE as ACK, the eNB updates the current UE resident subband and search space configuration to the reconfigured UE resident subband and search space configuration;

After the UE in the LTE230 system uploads the resident subband and search space reconfiguration, if the reconfigured UE resident subband and search space configuration are different from the current UE resident subband and search space configuration, Then wait to receive the reconfiguration activated MAC CE, feed back ACK to the eNB after successful reception, and then update the current UE resident subband and search space configuration to the reconfigured UE resident subband and search space configuration .

Further, the UE performs ACK/NACK feedback to the eNB by using a Hybrid Automatic Repeat Request (HARQ) process.

Further, if the eNB receives the HARQ feedback from the UE as NACK and the maximum number of HARQ retransmissions has not been reached, retransmit the reconfiguration activation MAC CE to the UE.

Further, if the eNB receives the HARQ feedback from the UE as NACK, and the maximum number of HARQ retransmissions has been reached, record the number of activation failures.

Further, if the number of activation failures reaches a first preset number under the current UE resident subband and search space configuration, the eNB updates the current UE resident subband and search space configuration to the After reconfiguring the UE resident subband and search space configuration, the eNB initially transmits the reconfiguration activation MACCE to the UE again.

Further, if under the reconfigured UE camping subband and search space configuration, the number of activation failures reaches a second preset number, the eNB releases the UE.

Further, the eNB initially transmits the reconfiguration activation MAC CE by using a scheduling module.

Further, the reconfiguration activated MAC CE is transmitted through the logical channel ID reserved by the LTE230 system.

Further, the MAC CE for reconfiguration activation is 1 byte, wherein the first 3 bits of the 1 byte indicate that the current MAC is a MAC CE for reconfiguration activation.

Further, the HARQ process of the UE performs the ACK/NACK feedback to the eNB through the physical uplink control channel PUCCH of the LTE230 system.

It can be seen from the above scheme that the method for enhancing the consistency of reconfiguration resources of the LTE230 system of the present invention utilizes the logical channel identifier (LCID) reserved by the LTE230 system and the HARQ feedback function of the PUCCH channel to activate MAC CE by introducing reconfiguration resources , specifies the behavior of eNB and UE, and solves the above-mentioned problems caused by the reconfiguration completion of reconfiguration resources. Both the search space and the resident subband before and after reconfiguration send reconfiguration activation, which effectively solves the problem of PUCCH virtualization. detection problem; the method of the present invention is simple to implement, and greatly improves the consistency of reconfiguration resources, reduces service delay, and effectively improves system performance.

Description of drawings

FIG. 1 is a schematic diagram of a method for enhancing consistency of reconfiguration resources of an LTE230 system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the byte structure of the reconfiguration activated MAC CE in the embodiment of the present invention;

FIG. 3 is a flow chart of the eNB side in the embodiment of the present invention after receiving the completion of reconfiguration;

Fig. 4 is a flow chart of the UE side after the transmission reconfiguration is completed in the embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

As shown in FIG. 1, a method for enhancing the consistency of reconfiguration resources of an LTE230 system provided by an embodiment of the present invention mainly includes:

After the eNB (base station) in the LTE230 system receives the resident subband and search space reconfiguration uploaded by the UE (User Equipment, user terminal), if the reconfiguration of the UE resident subband and search space configuration is consistent with the current UE resident If the configuration of the subband and the search space are different, the MAC (Multiple Access Channel, Multiple Access Channel) CE (Control Element, Control Unit) is activated for initial transmission reconfiguration to the UE;

After receiving the feedback from the UE as ACK (Acknowledgment, confirmation), the eNB updates the current UE resident subband and search space configuration to reconfigure the UE resident subband and search space configuration;

After the UE in the LTE230 system uploads the resident subband and search space reconfiguration, if the reconfigured UE resident subband and search space configuration is different from the current UE resident subband and search space configuration, it waits to receive the reconfiguration activation MAC CE, after successful reception, feeds back ACK to eNB, and then updates the current UE resident subband and search space configuration to the reconfigured UE resident subband and search space configuration.

In a specific embodiment, the UE uses a HARQ (Hybrid Automatic Repeat reQuest, hybrid automatic repeat request) process to perform ACK/NACK feedback to the eNB.

In a specific embodiment, if the eNB receives the feedback from the UE as NACK and the maximum number of HARQ retransmissions has not been reached, the eNB retransmits the reconfiguration activation MAC CE to the UE.

In a specific embodiment, if the eNB receives the feedback from the UE as NACK and the maximum number of HARQ retransmissions has been reached, the number of activation failures is recorded.

In a specific embodiment, if under the current UE resident subband and search space configuration, the number of activation failures reaches the first preset number, the eNB updates the current UE resident subband and search space configuration to reconfigure the UE resident The configuration of the subband and search space is reserved, and then the eNB reconfigures and activates the MAC CE for the initial transmission to the UE. In a specific embodiment, the first preset number of times is once.

In a specific embodiment, if the number of activation failures reaches a second preset number of times under reconfiguration of the UE camping subband and search space configuration, the eNB releases the UE. In a specific embodiment, the second preset number of times is two.

In a specific embodiment, the eNB uses the scheduling module to reconfigure the initial transmission to activate the MAC CE.

In a specific embodiment, the reconfiguration activated MAC CE is transmitted through the logical channel ID reserved by the LTE230 system.

In a specific embodiment, the MAC CE for reconfiguration activation is 1 byte, wherein the first 3 bits of the 1 byte indicate that the current MAC is the MAC CE for reconfiguration activation.

In a specific embodiment, the HARQ process of the UE performs ACK/NACK feedback to the eNB through a PUCCH (Physical Uplink Control Channel, Physical Uplink Control Channel) of the LTE230 system.

In a specific embodiment, if the UE successfully decodes the PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel), it performs ACK feedback to the eNB, otherwise it performs NACK feedback. Among them, the PDSCH carries the MAC PDU, and the MAC PDU may contain the reconfiguration activation MAC CE (the eNB side knows whether it contains the reconfiguration activation MAC CE). If the ACK feedback is received and the MAC PDU is sent, the eNB will Know that the activation is successful, otherwise the activation fails.

For reconfiguration to activate MAC CE, refer to the structure shown in FIG. 2 . In a specific embodiment, the fixed length of the reconfiguration activation MACCE is 1 byte, and the meaning of the byte is defined as follows:

LCID (logical channel identify, logical channel identification): the first 3 bits of this byte, set it to "100" to indicate that the current MAC header activates MAC CE for reconfiguration.

R: Reserved bit, set to 1.

The following describes the eNB side process and UE side process respectively.

In order to facilitate the description of the base station side process, the following variables are defined:

UeRes: UE's resident subband and search space configuration

CurUeRes: The resident subband and search space configuration currently used by the UE, see the definition of UeRes for the structure.

ActFailNum: The number of activation failures. The first activation is performed in the resident subband and search space before reconfiguration. If the first activation fails, a second activation will be performed in the reconfigured search space. The purpose is to prevent PUCCH false detection and ACK false detection for NACK.

The start-up process of the eNB side after receiving the completion of reconfiguration is shown in Figure 3, including the following steps.

At first, the eNB starts the following processing flow after receiving the completion of reconfiguration:

Step a1, judging whether the reconfigured resident subband and search space (UeRes) is consistent with the resident subband and search space (CurUeRes) used by the current UE, if they are consistent, do not need to activate and end, otherwise enter step a2;

Step a2, set the number of activation failures (ActFailNum) to 0, and then enter step a3;

Step a3: Initial transmission reconfiguration of scheduling module activates MAC CE: the scheduling module selects an idle HARQ process, and sends MAC CE in the current resident subband and search space. Since different manufacturers have different implementations, details will not be repeated here, and then enter the step a4;

Step a4, judging whether the feedback received by the HARQ process is ACK, if so, enter step a5, otherwise (feedback is NACK) enter step a6;

Step a5, update the resident subband and search space (CurUeRes) currently used by the UE to be the resident subband and search space (UeRes) in the reconfiguration, and then end;

Step a6, judging whether the HARQ process has reached the maximum number of retransmissions, if not, proceed to step a7, otherwise proceed to step a8;

Step a7: The scheduling module retransmits and reconfigures to activate the MAC CE: the scheduling module uses the current HARQ process to be retransmitted, and resends the MAC CE in the current resident subband and search space. Due to the different specific implementations of different manufacturers, it will not be repeated here Repeat, then enter step a4;

Step a8, add 1 to the number of activation failures, that is, ActFailNum+1: indicates that the UE failed to activate reconfiguration in the current search space, and then enter step a9;

Step a9, determine whether the number of activation failures is greater than 1, if ActFailNum>1, go to step a11, otherwise go to step a10;

Step a10, update the resident subband and search space (CurUeRes) currently used by the UE to the resident subband and search space (UeRes) in the reconfiguration, and then return to step a3, in order to prevent the baseband from false detection of feedback (ACK detected as NACK), under the new configuration, resend reconfiguration activation in order to increase the probability of reconfiguration activation;

Step a11, notify the upper layer to release the UE: the reconfiguration cannot be activated after multiple attempts in the old configuration and the new configuration, indicating that there is a problem with the link, and releasing the UE can effectively save air interface resources.

The start-up process of the UE side after the completion of the transmission reconfiguration is shown in Figure 4, including the following steps.

Step b1. Determine whether the reconfigured resident subband and search space (UeRes) are consistent with the current UE used resident subband and search space (CurUeRes). If they are consistent, the process ends without waiting for reconfiguration activation, otherwise enter step b2;

Step b2, wait for reconfiguration to activate MAC CE: UE blindly detects PDCCH in the current resident subband and search space, and enters step b3;

Step b3, judging whether the reconfiguration activation MAC CE is received, if the UE receives the downlink authorization and the MAC PDU (Protocol Data Unit, protocol data unit) carried in the PDSCH indicated by the downlink authorization contains the reconfiguration activation MAC CE, enter Step b4, otherwise go to step b2;

Step b4: Update the resident subband and search space (CurUeRes) currently used by the UE to the resident subband and search space (UeRes) in reconfiguration, and then end the process.

The method for enhancing the reconfiguration resource consistency of the LTE230 system in the embodiment of the present invention utilizes the logical channel identifier (LCID) reserved by the LTE230 system and the HARQ feedback function of the PUCCH channel, and activates the MAC CE by introducing reconfiguration resources. The behavior of the UE solves the above-mentioned problems introduced by reconfiguration resources relying on the completion of reconfiguration to take effect. Both the search space and the resident subband before and after reconfiguration send reconfiguration activation, which effectively solves the problem of PUCCH false detection; the present invention The method is simple to implement, and greatly improves the consistency of reconfiguration resources, reduces service delays, and effectively improves system performance.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

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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