CN102148676B - System and method for realizing downlink HARQ (hybrid automatic repeat request) - Google Patents
System and method for realizing downlink HARQ (hybrid automatic repeat request) Download PDFInfo
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Abstract
The invention discloses a system and method for realizing downlink HARQ (hybrid automatic repeat request), relating to the technical field of TD-LTE (TD-SCDMA long term evolution). The system comprises a dispatching module, a state machine maintenance module and a reply handling module, wherein the state machine maintenance module is used for maintaining a state machine, the state machine is used for storing an HARQ process and a structural unit of the HARQ process; the dispatching module is used for making a decision according to information stored by the state machine, dispatching other modules of the system to realize according functions and selecting the HARQ process to send the HARQ data; and the reply handling module is used for handling according to feedback information of the sent HARQ data. By adopting the system and method for realizing the downlink HARQ disclosed by the invention, a state linked list in the state machine is stored with different states of the HARQ process, and the reliability and timeliness of downlink HARQ data transmission in a TD-LTE system can be effectively guaranteed.
Description
Technical field
The present invention relates to TD-LTE (Time Division-Long Term Evolution) technical field, particularly a kind of descending HARQ's (HybridAutomatic Repeat Request, mixed automatic retransfer request) realizes system and method.
Background technology
Along with China TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) commercialization of mobile communication system, people have had higher requirement for the maximum data transmission rate of 3G mobile communication 2Mbit/s.For this reason, the standardization body such as 3GPP, 3GPP2 has successively proposed HSDPA (High Speed Downlink Packet Access, the high speed downlink packet access), the follow-up standards such as HSUPA (High Speed Uplink Packet Access, high speed uplink packet access), LTE (Long Term Evolution).The LTE standard definition Frequency Division Duplexing (FDD) (FDD) and time division duplex (TDD) dual mode, wherein TD-LTE because can be compatible with TD-SCDMA, coexist, become the inexorable trend of China TD-SCDMA evolution.
In the TD-LTE system, be user's two requirements the most basic to communication at a high speed and accurately.Therefore, guarantee that the data of high-speed transfer can arrive user terminal like clockwork, naturally become the problem that the TD-LTE system need to solve.Error-control technique provides basic solution for this problem, particularly combines the HARQ technology of error control coding, can effectively guarantee reliable transfer of data especially.In the TD-LTE system, descending HARQ mainly adopts (Stop-And-Wait) re-transmission mode of multi-process " stop-wait ", the process that substantially realizes is as follows: if eNodeB is (Evolved NodeB, the title of base station) the downlink data block transmission is correct, UE (User Equipment) sends ack signal by up channel to eNodeB, and eNodeB sends next new data block after receiving ack signal; If downlink data block loading error occurring, UE send the NACK signal, eNodeB resends same data block after receiving the NACK signal, and UE merges the data retransmission received and the data of early decoding failure, then carries out decoding and error checking etc.; So repeat until transmission is correct or number of retransmissions reaches the maximum retransmission of predesignating.
Consider the special frames structure of TD-LTE system, the function of its descending HARQ has following characteristic.
1.TD-LTE adopted the HARQ technology of " stop-wait " in system, for each HARQ process, all can exist and wait for the time of replying.In order to take full advantage of time-domain resource, further adopted the HARQ technology of multi-process.When needs carried out the high speed business transmission, the HARQ process of a plurality of " stop-waits " all started simultaneously, based on this technology, and the reasonability of the scheduling between necessary each HARQ process of assurance and different HARQ process and ageing.
2.TD-LTE in system, the structure of a system-frame has various configurations.Each system-frame has different uplink-downlink configuration, has namely required descending HARQ to need to have restriction on time domain in scheduling process.Wherein, descending HARQ sends data and must guarantee to send in available downlink frame, corresponding, the feedback information of this process must send in uplink frame.The requirement of TD-LTE system on the HARQ sequential is very strict, to guarantee the accuracy of HARQ communication.Like this, for how confirming fast and effeciently that the sequential relationship between downlink data and feedback is particularly important.
In sum, people are in the urgent need to the system and method for realizing of a kind of reliability that can guarantee descending HARQ transfer of data in the TD-LTE system and ageing descending HARQ.
Summary of the invention
The technical problem that (one) will solve
The technical problem to be solved in the present invention is: the system and method for realizing how a kind of reliability that can guarantee descending HARQ transfer of data in the TD-LTE system and ageing descending HARQ are provided.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides the system that realizes of a kind of descending HARQ, it comprises: scheduler module 100, state machine maintenance module 200 and reply processing module 300;
Described state machine maintenance module 200 is used for maintenance state machine 201, and described state machine 201 is used for the construction unit of storage HARQ process and HARQ process;
Described scheduler module 100 is used for carrying out decision-making according to described state machine 201 canned datas, and other modules of dispatching described system realize corresponding function, and is used for selecting described HARQ process to send described HARQ data;
Described reply processing module 300 is used for carrying out respective handling according to the feedback information that sends the HARQ data;
The construction unit of described HARQ process comprises: HARQ process, the HARQ data that described HARQ process sends, and the number of retransmissions of described HARQ data.
Preferably, described state machine 201 comprises 3 state-chain-tables: idle chained list, wait are replied chained list and are waited for the re-transmission chained list.
Preferably, the HARQ process of described idle storage of linked list idle condition, and the idle head pointer that points to first HARQ process in described idle chained list.
Preferably, the construction unit that storage of linked list is in the HARQ process of waiting for recoil state is replied in described wait;
Described wait is replied chained list and is also stored the reply head pointer that sensing is in the construction unit of the HARQ process of waiting for recoil state at first.
Preferably, described wait retransmits the construction unit that storage of linked list is in the HARQ process of waiting for the re-transmission state;
Described wait retransmits chained list and also stores the re-transmission head pointer that sensing is in the construction unit of the HARQ process of waiting for the re-transmission state at first.
The present invention also provides a kind of method of using described system to realize descending HARQ, and it comprises step:
S100: scheduler module 100 judgements wait for that whether retransmit chained list is empty, if be empty, carries out S200, otherwise carries out S300;
S200: scheduler module 100 sends the HARQ data, and 200 pairs of state machines of state machine maintenance module 201 carry out corresponding state-maintenance, carries out S400;
S300: scheduler module 100 sends waits for the HARQ data that retransmit, and 200 pairs of state machines of state machine maintenance module 201 carry out corresponding state-maintenance, carry out S100;
S400: judge whether to also have the HARQ data that need transmission, if having, carry out described step S200, process accordingly according to the feedback information of the HARQ data that sent otherwise reply processing module 300.
Preferably, described step S200 further comprises step:
S201: scheduler module 100 is stored to HARQ data to be sent in the data buffer storage chained list;
S202: wait for available system descending subframe, described available system descending subframe is called the not busy head pointer of idle chained list hollow HARQ process pointed;
S203: obtain the HARQ process that the not busy head pointer of idle chained list hollow points to, build the construction unit of described HARQ process, described HARQ process sends described HARQ data, the construction unit of described HARQ process is inserted in wait reply chained list, delete the HARQ process that the not busy head pointer of idle chained list hollow points to, idle head pointer points to next HARQ process in idle chained list, carries out S400.
The feedback information of the HARQ data that preferably, in described step S400, basis has sent carries out corresponding processing and specifically comprises:
If feedback information is ACK, obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, this HARQ process is inserted in idle chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, reply the construction unit of the next HARQ process of head pointer sensing, corresponding HARQ data in deletion data buffer storage chained list;
If feedback information is NACK, whether judgement reaches set point to the number of retransmissions of HARQ data that should feedback information, if reach, carries out S401, otherwise carries out S402;
S401: obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, this HARQ process is inserted in idle chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, reply the construction unit of the next HARQ process of head pointer sensing, corresponding HARQ data in deletion data buffer storage chained list;
S402: obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, the construction unit of described HARQ process is inserted in wait re-transmission chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, replys the construction unit that head pointer points to next HARQ process.
Preferably, in described step S300, state machine 201 being carried out corresponding state-maintenance comprises: revise and wait for the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list, amended this construction unit is inserted wait in the reply chained list, the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list is waited in deletion, retransmits the construction unit that head pointer points to next HARQ process.
Preferably, also comprise step S000 before described step S100: 200 pairs of idle chained lists of scheduler module 100 dispatch state machine maintenance modules, wait are replied chained list and are waited for that retransmitting chained list carries out initialization.
(3) beneficial effect
Descending HARQ of the present invention realizes system and method, different conditions by the storage of the state-chain-table in state machine HARQ process, and by the state machine maintenance module, each state-chain-table is carried out state-maintenance, can effectively guarantee the reliability of descending HARQ transfer of data in the TD-LTE system and ageing.
Description of drawings
Fig. 1 be the described descending HARQ of embodiments of the invention realize the system module structure chart;
Fig. 2 is 3 included state-chain-table structure charts of the described state machine of embodiments of the invention;
Fig. 3 is the implementation method flow chart of the described descending HARQ of embodiments of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Fig. 1 be the described descending HARQ of embodiments of the invention realize the system module structure chart.As shown in Figure 1, the system that realizes of this descending HARQ comprises: scheduler module 100, state machine maintenance module 200 and reply processing module 300;
Described state machine maintenance module 200 is used for maintenance state machine 201, and described state machine 201 is used for the construction unit of storage HARQ process and HARQ process;
Described scheduler module 100 is used for carrying out decision-making according to described state machine 201 canned datas, and other modules of dispatching described system realize corresponding function, and is used for selecting described HARQ process to send described HARQ data;
Described reply processing module 300 is used for carrying out respective handling according to the feedback information that sends the HARQ data;
The construction unit of described HARQ process comprises: HARQ process, the HARQ data that described HARQ process sends, and the number of retransmissions of described HARQ data.
Fig. 2 is 3 included state-chain-table structure charts of the described state machine of embodiments of the invention.As shown in Figure 2, described 3 state-chain-tables are: idle chained list, wait are replied chained list and are waited for the re-transmission chained list.The change of each HARQ process status realizes by the transfer between the different conditions chained list.
Described idle chained list depository (for convenience of storage, is only stored the pointer that points to this HARQ process, as the process number of this HARQ process, can be called easily this HARQ process by this pointer in the HARQ of idle condition process in chained list.), also the idle head pointer of the HARQ process of first idle condition is pointed in storage.
The construction unit that storage of linked list is in the HARQ process of waiting for recoil state is replied in described wait.The construction unit of described HARQ process comprises: the HARQ process, and to HARQ data that should the HARQ process, and the number of retransmissions of these HARQ data.For the HARQ data, only store the address pointer that points to these HARQ data in chained list, can conveniently store like this, and the HARQ process can be transformed between different conditions more efficiently, and do not need directly corresponding HARQ data to be operated, greatly improved system effectiveness.Described wait is replied chained list and is also stored the reply head pointer, replys tail pointer and reply free pointer.Described reply head pointer points to the construction unit that is at first the HARQ process of waiting for recoil state.Described reply tail pointer points to the construction unit that is at last the HARQ process of waiting for recoil state.Described reply free pointer is pointed to this wait and is replied insertable free cells address in chained list, in order to store the new construction unit that is in the HARQ process of waiting for recoil state.
Described wait retransmits the construction unit that storage of linked list is in the HARQ process of waiting for the re-transmission state.Described wait retransmits chained list and also stores the re-transmission head pointer, retransmits tail pointer and retransmit free pointer.Described re-transmission head pointer points to the construction unit that is at first the HARQ process of waiting for the re-transmission state.Described re-transmission tail pointer points to the construction unit that is at last the HARQ process of waiting for the re-transmission state.Described biography free pointer is pointed to this wait and is retransmitted insertable free cells address in chained list, in order to store the new construction unit that is in the HARQ process of waiting for the re-transmission state.
Fig. 3 is the implementation method flow chart of the described descending HARQ of embodiments of the invention.As shown in Figure 3, the method comprising the steps of:
S100: scheduler module 100 judgements wait for that whether retransmit chained list is empty, if be empty, carries out S200, otherwise carries out S300;
S200: scheduler module 100 sends the HARQ data, and 200 pairs of state machines of state machine maintenance module 201 carry out corresponding state-maintenance, carries out S400;
S300: scheduler module 100 sends waits for the HARQ data that retransmit, and 200 pairs of state machines of state machine maintenance module 201 carry out corresponding state-maintenance, carry out S100;
S400: judge whether to also have the HARQ data that need transmission, if having, carry out described step S200, otherwise reply processing module 300 receiving feedback informations, and process accordingly according to described feedback information.
Described step S200 further comprises step:
S201: scheduler module 100 is stored to HARQ data to be sent in the data buffer storage chained list;
S202: wait for available system descending subframe, described available system descending subframe is called the not busy head pointer of idle chained list hollow HARQ process pointed.
S203: obtain the HARQ process that the not busy head pointer of idle chained list hollow points to, build the construction unit of described HARQ process, described HARQ process sends described HARQ data, the construction unit of described HARQ process is inserted in wait reply chained list, delete the HARQ process that the not busy head pointer of idle chained list hollow points to, idle head pointer points to next HARQ process in idle chained list, carries out S400.
Carrying out corresponding processing according to described feedback information in described step S400 specifically comprises:
If feedback information is ACK (the expression receiving terminal has correctly received corresponding HARQ data), obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, this HARQ process is inserted in idle chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, reply the construction unit of the next HARQ process of head pointer sensing, corresponding HARQ data in deletion data buffer storage chained list.
If feedback information is NACK (expression receiving terminal do not received corresponding data block), whether judgement reaches set point to the number of retransmissions of HARQ data that should feedback information, if reach, carries out S401, otherwise carries out S402.
S401: obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, the construction unit of this HARQ process is inserted in idle chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, reply the process number of the next HARQ process of head pointer sensing, corresponding data block in deletion data buffer storage chained list.
S402: obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, the construction unit of described HARQ process is inserted in wait re-transmission chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, replys the construction unit that head pointer points to next HARQ process.
In described step S300, state machine 201 being carried out corresponding state-maintenance comprises: revise and wait for the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list, amended this construction unit is inserted wait in the reply chained list, the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list is waited in deletion, retransmits the construction unit that head pointer points to next HARQ process.
Also comprise step S000 before described step S100: 200 pairs of idle chained lists of scheduler module 100 dispatch state machine maintenance modules, wait are replied chained list and are waited for that retransmitting chained list carries out initialization.
Suppose to adopt 3 descending HARQ processes (process number is made as respectively 1,2,3) and 3 groups of HARQ data (group number is respectively 1,2,3) that the implementation method of descending HARQ of the present invention is described, concrete implementation step is as follows:
S1: 3 state-chain-tables of scheduler module 100 dispatch state machine maintenance module 200 initialization.At this moment, in the data buffer storage chained list, content is empty.In idle chained list, 3 HARQ processes that are in idle condition are arranged, expression HARQ process 1,2,3 is all available, and wherein idle head pointer points to HARQ process 1, represents available at first HARQ process.Wait for and reply chained list and wait for that it is all empty retransmitting in chained list, represents the current HARQ process that is not in this state.
S2: judgement waits for whether retransmit chained list is empty, if be not empty, expression has the HARQ data to wait for re-transmission, wait for an available system descending subframe, this system descending subframe is called the not busy head pointer of idle chained list hollow HARQ process pointed and is sent this and treat data retransmission, and state machine maintenance module 200 carries out the renewal of state-chain-table.The state-chain-table here upgrades and comprises: obtain and wait for the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list, the number of retransmissions value of HARQ data in the construction unit of this HARQ process is added 1, this construction unit after upgrading is inserted into waits in the reply chained list.The construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list is waited in deletion, retransmits the construction unit that head pointer points to next HARQ process.The priority of data retransmission sends higher than new data, so if also there are data to be retransmitted, continue to carry out this step, carries out retransmitting.Obviously, do not wait for the data that retransmit this moment, carries out S3.
S3: scheduler module 100 is waited for an available system descending subframe, this system descending subframe is called the not busy head pointer of idle chained list hollow HARQ process pointed, obtain HARQ process 1, build the construction unit of HARQ process 1, HARQ process 1 sends HARQ data 1, the construction unit of HARQ process 1 is inserted wait in the reply chained list; HARQ process 1 is deleted from idle chained list, move after idle head pointer, point to HARQ process 2.
S4: repeating step S2, S3 can send HARQ data 1,2,3 successively, and it is the HARQ process 1,2,3 of correspondence respectively.At this moment, 3 HARQ processes all are in the wait recoil state.The idle condition chained list is empty, waits for that it is empty retransmitting chained list.
S5: reply processing module 300 and receive return information, process.
If first return information is ACK, represent the HARQ data 1 that receiving terminal has correctly received.At this moment, HARQ process 1 is inserted in idle chained list; Delete from waiting for replying the construction unit that it replys head pointer HARQ process 1 pointed chained list, reply the construction unit that head pointer points to HARQ process 2; With HARQ data corresponding in the buffer memory chained list 1 deletion.Receive 3 ACK if connect this moment, 3 available processes are arranged in idle chained list, wait for and reply chained list and wait for that it is all empty retransmitting chained list.
If first return information is NACK, represent that receiving terminal does not correctly receive HARQ data 1.At this moment, if HARQ data 1 reach maximum retransmission, abandon retransmitting, HARQ process 1 is inserted in idle chained list; Delete from waiting for replying the construction unit that it replys head pointer HARQ process 1 pointed chained list, reply the construction unit that head pointer points to HARQ process 2; With HARQ data corresponding in the buffer memory chained list 1 deletion.If maximum retransmission is 3, do not reach maximum retransmission this moment, the construction unit insertion of HARQ process 1 is waited for retransmitting in chained list, deleted the construction unit of replying head pointer HARQ process 1 pointed chained list from waiting for replying, reply the construction unit that head pointer points to HARQ process 2.HARQ data 1 can be retransmitted when carrying out the method next time again, until its number of retransmissions reaches 3 times, perhaps reply processing module 300 and receive corresponding its ACK information.
Descending HARQ of the present invention realizes system and method, different conditions by the storage of the state-chain-table in state machine 201 HARQ process, and by the state machine maintenance module, each state-chain-table is carried out state-maintenance, can effectively guarantee the reliability of descending HARQ transfer of data in the TD-LTE system and ageing.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (2)
1. a method that realizes descending HARQ, is characterized in that, comprises step:
S100: scheduler module (100) judgement waits for that whether retransmit chained list is empty, if be empty, carries out S200, otherwise carries out S300;
S200: scheduler module (100) sends the HARQ data, and state machine maintenance module (200) carries out corresponding state-maintenance to state machine (201), carries out S400;
Described step S200 further comprises step:
S201: scheduler module (100) is stored to HARQ data to be sent in the data buffer storage chained list;
S202: wait for available system descending subframe, described available system descending subframe is called the not busy head pointer of idle chained list hollow HARQ process pointed;
S203: obtain the HARQ process that the not busy head pointer of idle chained list hollow points to, build the construction unit of described HARQ process, described HARQ process sends described HARQ data, the construction unit of described HARQ process is inserted in wait reply chained list, delete the HARQ process that the not busy head pointer of idle chained list hollow points to, idle head pointer points to next HARQ process in idle chained list, carries out S400;
S300: scheduler module (100) sends waits for the HARQ data that retransmit, and 200 pairs of state machines of state machine maintenance module (201) carry out corresponding state-maintenance, carry out S100;
In described step S300, state machine (201) being carried out corresponding state-maintenance comprises: revise and wait for the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list, amended this construction unit is inserted wait in the reply chained list, the construction unit that retransmits the HARQ process that retransmits the head pointer sensing in chained list is waited in deletion, retransmits the construction unit that head pointer points to next HARQ process;
S400: judge whether to also have the HARQ data that need transmission, if having, carry out described step S200, process accordingly according to the feedback information of the HARQ data that sent otherwise reply processing module (300);
The feedback information of the HARQ data that in described step S400, basis has sent carries out corresponding processing and specifically comprises:
If feedback information is ACK, obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, this HARQ process is inserted in idle chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, reply the construction unit of the next HARQ process of head pointer sensing, corresponding HARQ data in deletion data buffer storage chained list;
If feedback information is NACK, whether judgement reaches set point to the number of retransmissions of HARQ data that should feedback information, if reach, carries out S401, otherwise carries out S402;
S401: obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, this HARQ process is inserted in idle chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, reply the construction unit of the next HARQ process of head pointer sensing, corresponding HARQ data in deletion data buffer storage chained list;
S402: obtain and wait for the construction unit of replying head pointer HARQ process pointed in the reply chained list, the construction unit of described HARQ process is inserted in wait re-transmission chained list, deletion is waited for and is replied the construction unit of replying head pointer HARQ process pointed in chained list, replys the construction unit that head pointer points to next HARQ process.
2. the method for claim 1, is characterized in that, also comprises step S000 before described step S100: scheduler module (100) dispatch state machine maintenance module (200) is replied chained list to idle chained list, wait and is waited for that retransmitting chained list carries out initialization.
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| CN1685653A (en) * | 2002-10-24 | 2005-10-19 | 三星电子株式会社 | Apparatus for controlling a hybrid automatic repeat request protocol (HARQ) in a mobile communication system |
| CN101960768A (en) * | 2008-03-03 | 2011-01-26 | 高通股份有限公司 | Adding hybrid ARQ to WLAN protocols with MAC based feedback |
| CN102045132A (en) * | 2009-10-23 | 2011-05-04 | 华为技术有限公司 | Retransmission mechanism-based method and device for transmitting header compression data packet |
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| CN1685653A (en) * | 2002-10-24 | 2005-10-19 | 三星电子株式会社 | Apparatus for controlling a hybrid automatic repeat request protocol (HARQ) in a mobile communication system |
| CN101960768A (en) * | 2008-03-03 | 2011-01-26 | 高通股份有限公司 | Adding hybrid ARQ to WLAN protocols with MAC based feedback |
| CN102045132A (en) * | 2009-10-23 | 2011-05-04 | 华为技术有限公司 | Retransmission mechanism-based method and device for transmitting header compression data packet |
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