CN102447549A - Uplink synchronous hybrid automatic retransmission query method for mobile communication system - Google Patents
Uplink synchronous hybrid automatic retransmission query method for mobile communication system Download PDFInfo
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Abstract
The invention provides an uplink synchronous hybrid automatic retransmission query method for a mobile communication system, which comprises the steps that: A, a base station judges whether resource conflict is generated during the uplink processes of a plurality of customer equipment according to a scheduling algorithm strategy, and under the condition of being incapable of distributing the channel resource for costumers with lower business priorities, the invalid uplink authorization is generated, and is sent to the costumer equipment with lower business priorities through the downlink control information; and B, the costumer equipment with lower business priorities receives the downlink control information, the received invalid uplink authorization is determined according to the downlink control information, the retransmission of the uplink hybrid automatic retransmission query process on a preset position is eliminated according to the invalid uplink authorization, and the transmitted times are kept unchanged. After adopting the method disclosed by the invention, the available transmitted times of the hybrid automatic retransmission query (HARQ) process can be prevented from being reduced when the resource conflict is solved, so the residual HARQ error occurrence probability is reduced.
Description
Technical field
The present invention relates to the communication technology, the method for uplink synchronous mixed automatic repeat request in particularly a kind of GSM.
Background technology
(Long Term Evolution, LTE) transmitting uplink data of system adopts the automatic repetitive requests of synchronized mixes (Hybrid Automatic Repeat Request, HARQ) technology, and support self adaptation and two kinds of re-transmission modes of non-self-adapting to Long Term Evolution.
Fig. 1 is the method flow diagram of a kind of typical uplink synchronous mixed automatic repeat request of prior LTE system.Combine Fig. 1 at present, the method for the typical uplink synchronous mixed automatic repeat request of this kind of prior LTE system is described, specific as follows:
Because the up employing synchronous HARQ of LTE; Therefore the transmission time-domain position of each HARQ process of UE side is predefined; That is to say transmission for the first time and retransmit and on same process, carry out; Retransmit MACPDU and arranged at interval regular time between the transmission for the first time, do not need to indicate significantly corresponding HARQ process ID during re-transmission.On each predefine time-domain position, as long as the buffer memory of HARQ process is not empty, the uplink authorization of base station is arranged on this position perhaps, the HARQ entity all can indicate corresponding HARQ process transmission new data, self adaptation to retransmit or non-self-adapting retransmits.Self adaptation retransmit refer to configuration informations such as retransmitting the applied resource of MAC PDU, MCS with transmit employed corresponding configuration for the first time can be different, the clear and definite dispatch of needs is notified; And non-self-adapting retransmits and to be meant and to retransmit MAC PDU and to transmit employed resource, MCS the first time all identical, does not use clear and definite dispatch to notify.
Fig. 2 carries out HAQR method of operating flow chart for existing UE side HARQ entity.Combine Fig. 2 at present, existing UE side HARQ entity carried out the HARQ method of operating describe:
Step 201: confirm the HARQ process corresponding with subframe, the HARQ entity is regularly confirmed the HARQ process corresponding with this subframe according to subframe in this step, in this concrete definite method that repeats no more; Step 202 has judged whether that uplink authorization is indicated to said subframe, if; Execution in step 203, otherwise execution in step 204, the HARQ entity has judged whether that uplink authorization is indicated to said subframe in this step; Judge whether that just uplink authorization is indicated to the corresponding HARQ process of said subframe; If, execution in step 203, otherwise execution in step 204; Step 203; This process of type indication according to authorizing is carried out new data transmission or Adaptive Transmission; Execution in step 206 afterwards, and the HARQ entity indicates the corresponding HARQ process of said subframe to carry out new data transmission or Adaptive Transmission according to the type of uplink authorization in this step; Step 204 judges whether the buffer memory of this process is empty, if, execution in step 206, otherwise execution in step 205, the HARQ entity judges whether the buffer memory of the HARQ process that said subframe is corresponding is empty in this step; Step 205 is indicated this process to carry out non-self-adapting and is retransmitted, and the HARQ entity indicates the corresponding HARQ process of said subframe to carry out the non-self-adapting re-transmission in this step; Step 206 finishes.
Fig. 3 is the method flow diagram that existing UE side HARQ process is sent upstream data.Combine Fig. 3, the method for existing UE side HARQ process being sent upstream data describes, and is specific as follows at present:
In LET system uplink scheduling process; When under up heavy duty scene; Certain ascending HARQ course of a UE is by dynamically scheduling; Certain ascending HARQ course of another UE is by semi-persistent scheduling, and when identical and process dynamic dispatching had taken the re-transmission resource of process of semi-persistent scheduling when the predefine time-domain position of these two processes, the non-self-adapting of the process of dynamic dispatching retransmitted and possibly or retransmit conflict with the new data of the process of semi-persistent scheduling.When the situation of this resource contention takes place, possibly not exist other resources to supply the process of dynamic dispatching to carry out self adaptation because load is heavier and retransmit, thereby need the base station to forbid the re-transmission of HARQ process on the predefine time-domain position of this dynamic dispatching.Method according to Fig. 1, Fig. 2 and Fig. 3 can be known; ENB if the HARQ process that will forbid UE in the locational transmission of predefine; Needing feedback content in advance is the HARQ process that the HARQ of ACK feeds back to the UE side; Though but the HARQ process is the HARQ feedback information of ACK when not retransmitting according to content, corresponding retransmission opportunity reduces once (like the step 310 of Fig. 3), on the predefine time-domain position of section sometime, has abandoned transmission though that is to say the HARQ process; But the number of transmissions on these predefine time-domain positions still can be counted the number of transmissions, and this has just caused the minimizing of the actual available transmission number of times of said HARQ process.And according to existing ascending HARQ transmission mechanism, when one timing of HARQ maximum transmission times, the actual the number of transmissions that can use of HARQ process is few more, and the probability that residue HARQ mistake takes place is big more.
Also exist in the method for the uplink synchronous mixed automatic repeat request of existing LTE-A (LTE-Advanced) system uplink synchronous mixed automatic repeat request shown in Figure 1 problem; In other words; All can when solving resource contention, cause the minimizing of the actual available transmission number of times of HARQ process in the method for the uplink synchronous mixed automatic repeat request of prior LTE system and LTE-A system, residue HARQ mistake probability of happening increases.
Summary of the invention
In view of this; Goal of the invention of the present invention is to provide the method for uplink synchronous mixed automatic repeat request in a kind of GSM; This method can be avoided the minimizing of HARQ process available transmission number of times when solving resource contention, reduce residue HARQ mistake probability of happening.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
The method of uplink synchronous mixed automatic repeat request in a kind of GSM, this method comprises:
When A, base station judge the up process generation resource contention of a plurality of subscriber equipmenies according to the dispatching algorithm strategy; Can't be for service priority under the situation of lower user equipment allocation channel resource; Generate invalid uplink authorization, and send invalid uplink authorization through Downlink Control Information and give the lower subscriber equipment of said service priority;
B, the subscriber equipment that said service priority is lower receive Downlink Control Information; Confirm to receive invalid uplink authorization according to Downlink Control Information; Cancel up mixed automatic repeat request process in the locational re-transmission of predefine according to invalid uplink authorization, the number of transmissions remains unchanged.
In the said method, the method that the said base station of steps A generates invalid uplink authorization is: the base station with resource block assignments among the form DCI format 0 of Downlink Control Information and frequency-hopping resource allocation domain be arranged to can not corresponding efficient resource the resource indicated value.
In the said method, the said base station of steps A is sent invalid uplink authorization through Downlink Control Information and is for the method for the lower subscriber equipment of said service priority: DCI format 0 that resource block assignments and frequency-hopping resource allocation domain be configured to resource indicated value that can not corresponding efficient resource is sent to the lower subscriber equipment of said service priority in the base station.
In the said method; Step B is said to confirm that according to Downlink Control Information the method that receives invalid uplink authorization is: the up mixed automatic repeat request HARQ entity that the subscriber equipment that said service priority is lower comprises is according to the Downlink Control Information that receives; Confirm resource indicated value among the form DCI format 0 of Downlink Control Information corresponding be invalid resource, then confirm to receive invalid uplink authorization.
In the said method; Step B is said to be cancelled up mixed automatic repeat request process according to invalid uplink authorization and in the method for the locational re-transmission of predefine be: said HARQ entity defines invalid uplink authorization and indicates to subframe; Then said subframe is not carried out the HARQ operation, do not send the corresponding HARQ process of indication to said subframe.
Above-mentioned technical scheme is visible; In the GSM provided by the invention in the method for uplink synchronous mixed automatic repeat request; After the base station detects to the up course allocation channel resource of a plurality of UE the time and has resource contention; Can select not redispatch ACK information to the lower UE of service priority; But send the lower UE of invalid uplink authorization a to service priority, and make the lower UE of service priority no longer indicate the HARQ process corresponding to carry out any operation with this UE, not only cancelled ascending HARQ course data retransmission on predefined time-domain position; And the number of transmissions of cancellation can not count the number of transmissions yet, avoided in the existing method because the number of transmissions of cancellation still counts the problem of the residue HARQ mistake probability of happening increase that the number of transmissions causes.
Description of drawings
Fig. 1 is the method flow diagram of a kind of typical uplink synchronous mixed automatic repeat request of prior LTE system.
Fig. 2 carries out HAQR method of operating flow chart for existing UE side HARQ entity.
Fig. 3 is the method flow diagram that existing UE side HARQ process is sent upstream data.
Fig. 4 is the method flow diagram of uplink synchronous mixed automatic repeat request in the GSM of the present invention.
Embodiment
For make the object of the invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to further explain of the present invention.
In order to solve in the prior art because the problem that the actual available transmission number of times of the HARQ process that causes in the resource contention solution process reduces; The invention provides the method for uplink synchronous mixed automatic repeat request in a kind of GSM; After eNB in this method judges resource that the up process of a plurality of UE uses resource contention has taken place according to the dispatching algorithm strategy; Can't distribute under the situation of other channel resources by lower UE for service priority; ENB is when the re-transmission of cancellation ascending HARQ course on predefined time-domain position; Can select feedback content not is that the HARQ of ACK feeds back to the lower UE of service priority; But sending an invalid lower UE of said service priority that licenses to, the HARQ entity that receives the UE side of invalid mandate is removed the uplink authorization information of said HARQ process, the indication HARQ process transmission of not redispatching new data, indication to the said HARQ process that self adaptation retransmits or non-self-adapting retransmits; The HARQ process keeps that the number of transmissions is constant, thereby has avoided said HARQ process not data retransmission and problem that HARQ mistake probability of happening that the number of transmissions increase causes increases.
Fig. 4 is the method flow diagram of uplink synchronous mixed automatic repeat request in the GSM of the present invention.As shown in Figure 4; The method of uplink synchronous mixed automatic repeat request can be applicable in LTE system or the LTE-A system in the GSM of the present invention; Compare with the method for uplink synchronous mixed automatic repeat request in the prior LTE system shown in Figure 1, the step 401 of method of the present invention to step 407 is obviously different with step 101 to step 107 in the existing method, and other steps are identical; Only different steps is described at this, specific as follows:
The MAC layer of step 401:eNB side sends the HARQ entity that resource contention information is given the eNB side;
ENB is when being the up course allocation channel resource of a plurality of UE; Judge through existing dispatching algorithm strategy whether the resource that the up process of a plurality of UE is used clashes; If, be other channel resource of the up course allocation of the lower UE of service priority then according to the height of service priority; If there is not the up process that suitable channel resource allocation is given UE this moment, then the MAC layer through the eNB side sends the HARQ entity that resource contention information is given the eNB side; Otherwise, be the up course allocation channel resource of a plurality of UE according to the method for step 101.
Above-mentioned resource contention information is sent through the existing resources assignment information.
Resource contention information is the information of the up process of the UE that clashes.
The HARQ entity of step 402:eNB side sends the PHY layer that resource contention information is given the eNB side;
The HARQ entity of eNB side sends to the PHY layer of eNB side with resource contention information, specifically can send above-mentioned resource contention information through the existing resources assignment information.
The PHY layer of step 403:eNB side generates invalid uplink authorization according to the resource contention information that receives, and sends the invalid up PHY layer of giving the UE side through DCI format 0;
Resource block assignments and frequency-hopping resource allocation domain among the DCI format 0 among the present invention comprises
individual bit altogether; Resource Physical Resource Block for uplink assignment in the prior LTE system is continuous; Initial resource block location and the number of continuous resource piece of distributing to the resource of a UE can obtain through the number value that
individual bit is represented; This numerical value be called as the resource indicated value (Resource Indication Value, RIV).Under all band width configuration in prior LTE system; Be not that
individual bit all RIV that can represent can both corresponding one section efficient resource, the RIV that those can not corresponding efficient resource is not used to do normal resource allocation.
The PHY layer of eNB side is according to the resource contention information that receives; With resource block assignments among the DCI format 0 and frequency-hopping resource allocation domain be arranged to can not corresponding efficient resource resource indicated value (Resource Indication Value; RIV), send the PHY layer of invalid uplink authorization to UE side through DCI format 0.Such as: eNB can adopt resource block assignments and the frequency-hopping resource allocation domain with
individual bit to be made as " 1 " entirely; Because this value can not corresponding efficient resource position, UE receives and is made as full the uplink authorization information of " 1 " by
individual bit can to judge this uplink authorization be invalid uplink authorization.
The PHY layer of step 404:UE side sends the HARQ entity that invalid uplink authorization is given the UE side;
The invalid uplink authorization information (Info) of passing through existing Physical Downlink Control Channel (PDCCH) transmission that the PHY layer of UE side will be received sends to the HARQ entity of UE side.
The HARQ entity of step 405:UE side judges whether to receive invalid uplink authorization, if, execution in step 406, otherwise execution in step 407;
Whether corresponding efficient resource judges whether to receive invalid uplink authorization to the RIV of the HARQ entity of UE side through judging
individual bit; If; Execution in step 406, otherwise execution in step 407.
Step 406: subframe is not carried out the HARQ operation;
The HARQ entity of UE side confirms that invalid uplink authorization indicates to subframe, then said subframe is not carried out the HARQ operation.
The difference that the HARQ entity of UE side of the present invention carries out HARQ method of operating and existing HARQ method of operating shown in Figure 2 is; The HARQ entity has judged whether that at first invalid uplink authorization indicates to subframe; If; End operation then, otherwise operate according to the method for step 201 shown in Figure 2 to step 206, repeat no more at this.
The method of sending upstream data for the HARQ of UE side of the present invention is identical with the method that existing UE side HARQ shown in Figure 3 sends upstream data, repeats no more at this.
In the preferred embodiment of the present invention; After the base station detects to the up course allocation channel resource of a plurality of UE the time and has resource contention; The ACK information of not redispatching is given the HARQ entity, just no longer through indication cancellation ascending HARQ course on predefined time-domain position the data retransmission of HARQ entity to the HARQ process, but sends an invalid uplink authorization to the HARQ entity; Make HARQ entity control HARQ process not carry out any operation; This moment, the number of transmissions of HARQ process remained unchanged, and like this, had not only cancelled ascending HARQ course data retransmission on predefined time-domain position; And the number of transmissions of cancellation can not count the number of transmissions yet, avoided in the existing method because the number of transmissions of cancellation still counts the problem of the residue HARQ mistake probability of happening increase that the number of transmissions causes.In addition; Though the present invention is as embodiment with the LTE system; But because the LTE-A system has inherited the HARQ method of LTE system basically; Method of the present invention can be applied to the LTE-A system equally, reduces the problem that residue HARQ mistake probability of happening increases to solve the HARQ process available transmission number of times that exists in the LTE-A system.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (5)
1. the method for uplink synchronous mixed automatic repeat request in the GSM is characterized in that this method comprises:
When A, base station judge the up process generation resource contention of a plurality of subscriber equipmenies according to the dispatching algorithm strategy; Can't be for service priority under the situation of lower user equipment allocation channel resource; Generate invalid uplink authorization, and send invalid uplink authorization through Downlink Control Information and give the lower subscriber equipment of said service priority;
B, the subscriber equipment that said service priority is lower receive Downlink Control Information; Confirm to receive invalid uplink authorization according to Downlink Control Information; Cancel up mixed automatic repeat request process in the locational re-transmission of predefine according to invalid uplink authorization, the number of transmissions remains unchanged.
2. method according to claim 1; It is characterized in that the method that the said base station of steps A generates invalid uplink authorization is: the base station with resource block assignments among the form DCI format 0 of Downlink Control Information and frequency-hopping resource allocation domain be arranged to can not corresponding efficient resource the resource indicated value.
3. method according to claim 2; It is characterized in that the said base station of steps A is sent invalid uplink authorization through Downlink Control Information and is for the method for the lower subscriber equipment of said service priority: DCI format 0 that resource block assignments and frequency-hopping resource allocation domain be configured to resource indicated value that can not corresponding efficient resource is sent to the lower subscriber equipment of said service priority in the base station.
4. method according to claim 1; It is characterized in that; Step B is said to confirm that according to Downlink Control Information the method that receives invalid uplink authorization is: the up mixed automatic repeat request HARQ entity that the subscriber equipment that said service priority is lower comprises is according to the Downlink Control Information that receives; Confirm resource indicated value among the form DCI format 0 of Downlink Control Information corresponding be invalid resource, then confirm to receive invalid uplink authorization.
5. method according to claim 4; It is characterized in that; Step B is said to be cancelled up mixed automatic repeat request process according to invalid uplink authorization and in the method for the locational re-transmission of predefine be: said HARQ entity defines invalid uplink authorization and indicates to subframe; Then said subframe is not carried out the HARQ operation, do not send the corresponding HARQ process of indication to said subframe.
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