CN102316516A - LTE uplink data transmission structure and control method - Google Patents
LTE uplink data transmission structure and control method Download PDFInfo
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Abstract
The invention relates to the field of mobile communications, and provides an LTE (Long Term Evolution) uplink data transmission structure. At a packet data convergence protocol layer, a PDCP (Packet Data Convergence Protocol) SDU (Service Data Unit) cache is added for storing a PDCP SDU IP (Internet Protocol) packet pointer which is transmitted from a higher level and not converted into a PDCP PDU (Protocol Data Unit); and at a radio link control layer, a RLC (Radio Link Control) SDU cache is deleted, and only a RLC PDU cache is reserved, the storage content of the RLC PDU cache is a RLC PDU to be confirmed, and the data forming the RLC PDU is obtained from the PDCP PDU cache. The invention further provides an LTE uplink data transmission control method. According to the structure and the method provided by the invention, an operable implementation scheme for high-speed and efficient transmission of the LTE uplink data is provided, which greatly reduces use of an internal memory, shortens data processing time and obviously improves the speed of data transmission.
Description
Technical field
The present invention relates to moving communicating field, particularly the mobile communication system user terminal (is called for short, UE) is realized the structure and the control method of transmitting uplink data, to satisfy the requirement of Long Term Evolution LTE system uplink data high-speed high efficiency of transmission.
Background technology
The evolution accessing network that the general continental rise wireless access network E-UTRAN of evolution is general continental rise wireless access network UTRAN; Its access technology that adopts is called Long Term Evolution and (is called for short: LTE) technology; Compare technical advantage such as LTE has high data rate, divide into groups to transmit, lowly postpone, backward compatible with 3G.TD-SCDMA is the same with TDS-CDMA system, and the wave point of LTE also is divided into layer one (Layer 1), layer two (Layer 2) and layer three (Layer3), but great changes have taken place the protocol description of each layer.
The demanding terminal of LTE system type 3 can provide the peak rate of descending 100Mbps, up 50Mbps under the 20MHz spectral bandwidth; This design performance to the protocol stack data path has proposed requirements at the higher level; When guaranteeing data transmission credibility, should improve the speed of transfer of data as far as possible.
According to each layer protocol, what transmitting uplink data was handled briefly is described below:
(1) high-rise module (is called: the IP bag (IP packet or IP controlling packet) of COM) receiving different sizes here; At first for adding the IP head of reservation and PDCP, the IP packet length (is called for short: the PDCP) internal memory of head length for each IP bag application size; Generate new IP bag, and the pointer of IP bag is forwarded to transit module (abbreviation: RABM).
(2) after transit module RABM receives the IP bag pointer that high-rise module COM sends, its content is not handled, just IP is wrapped pointer and be forwarded to radio bearer and (be called for short: RB) corresponding PDCP instance.
(3) after the PDCP module carries out head compression to the data of receiving and add PDCP header etc. handling, generate PDCP PDU, then data pointer is sent to corresponding Radio Link control and (is called for short: RLC) instance.
(4) when receiving medium access control layer, (is called for short: behind transmission opportunity MAC), with RLC SDU (being PDCP PDU) segmentation or be cascaded into RLC PDU, then RLC PDU is sent to the MAC layer RLC according to resource size.
(5) MAC receives the RLC PDU on each logic channel, can each PDU be assembled into MAC PDU, and send it to physical layer.
Structural design of each layer of protocol stack and data processing efficiency have influenced the protocol stack message transmission rate, realize that usually the transmitting uplink data process is as shown in Figure 1, are example with the transfer of data under the affirmation mode (AM).
Data processing in the sketch map 1 has following main points:
(1) at the PDCP layer, whenever receive a PDCP SDU, just convert it into PDCP PDU, this processing is to a slice address space, need not apply for new memory headroom.
(2) PDCP PDU (RLC SDU) is sent to rlc layer through the interlayer primitive (signaling between layer and the layer) of PDCP and RLC.
(3) at rlc layer, two data buffer memorys have been distributed: RLC SDU buffer memory and RLC PDU buffer memory.
(4) the MAC layer copies the RLC PDU on each logic channel to MAC PDU.
There is following problem in implementation method in the sketch map 1:
(1) the PDCP layer detects when receiving the IP controlling packet, need be inserted into first position of buffer memory, the preferential transmission, but PDCP SDU is a sequential queue, the IP controlling packet can not get priority treatment, causes the obstruction of data link easily.
(2) the RLC SDU that receives of RLC need carry out through the interlayer primitive of PDCP in the state machine and RLC alternately, under high rate data transmission, this alternately can be very frequent, reduced transmission rate.
(3) though the RLC SDU buffer memory of rlc layer is different with the information of the buffer memory preservation of PDCP PDU, there is duplicate message, causes the internal memory waste.
(4) after RLC receives the opportunity of MAC transmission data; When RLC SDU is assembled into RLC PDU; Since the big or small on-fixed of RLC PDU, need the dynamically internal memory of application RLC PDU, and the data of RLC SDU are copied among the RLC PDU; Frequent dynamic application internal memory and data copy can further cause transmission rate to reduce.
(5) when the MAC layer carries out the assembling of MAC PDU, need the RLC PDU of all logic channels is copied among the MAC PDU, this data copy also need spend certain hour, has reduced efficiency of transmission.
The above problem is mainly reflected on buffer memory distribution, internal memory application and the data copy, and these problems have not only restricted the service efficiency of internal memory, and have had a strong impact on the speed of transmitting uplink data, have reduced the stability of data path and the quality of service of UE.
Summary of the invention
The technical problem that the present invention solved is to have proposed a kind of LTE transmitting uplink data structure and control method, to reduce the time of data processing, reaches the up peak rate of LTE system as far as possible.
For overcoming the above problems, the present invention provides a kind of LTE transmitting uplink data structure, and is as shown in Figure 2, comprising:
At packet data convergence protocol PDCP, increase PDCP SDU buffer memory, be used to store the also unconverted PDCP SDU IP bag pointer that sends from high level for PDCP PDU; Continue to keep PDCP PDU buffer memory, be used for storage and sent and do not sent PDCP PDU data message, retransmit unacknowledged PDCP PDU when waiting for the affirmation of peer layer or rebuilding the PDCP instance;
Said PDCP SDU buffer memory or PDCP PDU buffer memory adopt the chained list management, as illustrate shown in Figure 3;
Said PDCP SDU buffer memory chain table management method is: when PDCP receives the IP controlling packet, and with first node of IP controlling packet pointer insertion chained list, the preferential transmission; When PDCP receives the IP packet, then be inserted into after the tail pointer pSduTail of chained list, and upgrade tail index p SduTail; When PDCP need generate PDCP PDU, just the nodal information of preserving in the chained list (PDCP SDU) is carried out after head compresses, encrypts, adds the PDCP head, be inserted into the end of PDCP PDU buffer memory chained list then, wait to be sent.
Said PDCP PDU buffer memory chain table management method is: PDCP PDU buffer memory chained list is safeguarded by PDCP and RLC module jointly; Comprise head pointer pPduHeader, first etc. PDCP PDU pointer pPduCur and tail pointer pPduTail to be sent; The nodal information of preserving between pPduHeader～pPduCur is the PDCP PDU that waits for that peers include both is confirmed, the nodal information of preserving between pPduCur～pPduTail such as is at PDCP PDU to be transmitted.
At wireless chain control layer RLC, deletion RLC SDU buffer memory only keeps RLC PDU buffer memory, RLC PDU buffer memory be RLC PDU to be confirmed, and the data that are assembled into RLC PDU obtain from PDCP PDU buffer memory.
For overcoming the above problems, the present invention also provides a kind of LTE transmitting uplink data control method, comprising:
Steps A: high-rise module COM is sent to packet data convergence protocol PDCP with the IP bag, and PDCP converts PDCP SDU into PDCP PDU according to the caching situation of current PDCP PDU;
Said PDCP is according to the caching situation of current PDCP PDU; Convert PDCP SDU to PDCP PDU: be less than the indication that Nx perhaps receives rlc layer if wait the data total amount of sending out PDU in the PDCP PDU buffer memory; Then convert PDCP SDU into PDCP PDU, wherein Nx is the maximum uplink data sending amount of 2-5 Transmission Time Interval TTI;
Step B: after medium access control layer MAC receives the ascending resource mandate or feedback UL Grant or PHICH that physical layer is sent; Scan the corresponding RLC metadata cache situation of each logic channel immediately; Add up the outgoing data amount of next transmission opportunity; According to the resource situation of network, be the corresponding resource of each logical channel assignment then, and the respective resources size is reported wireless chain control layer RLC through interlayer primitive;
The outgoing data amount of said next transmission opportunity of statistics comprises RLC PDU size and the RLC PDU head length degree adding up all the RLC SDU that do not send sizes, re-transmission RLC PDU size or retransmit RLC PDU fragment size, sign state.
Step C:RLC receives that MAC reports the interlayer primitive of resource size, according to the metadata cache situation of resource size and this RLC, carries out the assembling of corresponding PDU;
Said corresponding PDU is assembled into: if there is the RLC PDU of sign state to need assembling, then preferentially assemble STATUS PDU, assemble STATUS PDU according to the state report information that RLC preserves; Just assembling retransmits PDU then, retransmits PDU according to the retransmission information assembling; Assemble new biography PDU at last, from PDCP PDU buffer memory, obtain the RLC PDU that RLC SDU is assembled into new biography.
Step D:RLC is sent to MAC with the PDU that assembles, and after MAC receives the data on all logic channels, the PDU on each logic channel is assembled into MAC PDU, and fills the MAC head, then MAC PDU is sent to physical layer;
Step e: after RLC delivers to the MAC layer with RLC PDU, be less than Nx, then indicate the PDCP layer that PDCP SDU is converted into PDCP PDU if wait the data total amount of sending out PDU in the PDCP PDU buffer memory; Wherein Nx is the maximum uplink data sending amount of 2-5 Transmission Time Interval TTI.
The present invention realizes the high efficiency of transmission of LTE terminal upstream data through the interactive mode of change related protocol layer data buffer memory and way to manage and interlayer, and compared with prior art, the advantage of present technique scheme has:
The first, at the PDCP SDU buffer memory that the PDCP layer increases, solved the problem of priority treatment IP controlling packet, when the needs priority treatment the data congestion problem can not appear;
The second, removed RLC SDU buffer memory at rlc layer, RLC and PDCP safeguard PDCP PDU (RLC SDU) buffer memory jointly, the one, reduced the use of internal memory; The 2nd, reduced the mutual of state machine primitive, obtaining assembling RLC PDU during opportunity, RLC directly obtains data from PDCPPDU and assembles, and does not need earlier PDCP PDU to be issued RLC through interlayer primitive;
The 3rd; When RLC SDU is assembled into RLC PDU, need not apply for that new internal memory stores RLC SDU data, RLC PDU storage be the data pointer of RLC SDU and relevant data offset; Promptly save internal memory, shortened the processing time of dynamic application internal memory again;
The 4th, only there is secondary data copy in the processing of whole protocol stack upstream data, i.e. the omnidistance use of IP data processing from the COM layer to MAC layer pointer operation, and the use of promptly having saved internal memory has reduced the time that the data copy is spent again.
In addition, design clear memory management efficiently: under the affirmation mode AM, at high-rise (COM) request for data internal memory, PDCP layer releasing memory (after receiving that peer layer is confirmed); Under the Unacknowledged Mode UM, at high-rise (COM) request for data internal memory, in MAC layer releasing memory (copy data to shared buffer memory after); Under the transparent mode TM, at RRC (Radio Resource control) layer request for data internal memory, in MAC layer releasing memory (copy data to shared buffer memory after);
In a word, the invention provides the practicable implementation of LTE upstream data high-speed transfer, greatly reduced the use of internal memory, shortened the time of data processing, obviously improve the speed of transfer of data.
Description of drawings
Fig. 1 is a prior art transmitting uplink data structure chart
Fig. 2 is a transmitting uplink data structure chart of the present invention
Fig. 3 is PDCP layer buffer memory chained list management sketch map of the present invention
Fig. 4 is a transmitting uplink data control method flow chart of the present invention
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer; Below in conjunction with accompanying drawing and embodiment; Structure and control method to a kind of LTE upstream data of the present invention high efficiency of transmission explain further details; Some known implementation no longer details, to avoid there be unnecessary obscuring with content of the present invention.
A kind of LTE transmitting uplink data structure of the present invention, as shown in Figure 2, comprising:
At packet data convergence protocol PDCP, increase PDCP SDU buffer memory, be used to store the PDCP SDU IP bag pointer that sends the also unconverted PDCP PDU of being from high level; Continue to keep PDCP PDU buffer memory, be used for storage and sent and do not sent PDCP PDU data message, retransmit unacknowledged PDCP PDU when waiting for the affirmation of peer layer or rebuilding the PDCP instance;
Said PDCP SDU buffer memory or PDCP PDU buffer memory adopt the chained list management, and be as shown in Figure 3;
Said PDCP SDU buffer memory chain table management method is: when PDCP receives the IP controlling packet, and with first node of IP controlling packet pointer insertion chained list, the preferential transmission; When PDCP receives the IP packet, then be inserted into after the tail pointer pSduTail of chained list, and upgrade tail index p SduTail; When PDCP need generate PDCP PDU, just the nodal information of preserving among the chained list pSduHeader (PDCP SDU) is carried out head and compress, encrypt, add the PDCP head, be inserted into the end of PDCP PDU buffer memory then, wait to be sent.
Said PDCP PDU buffer memory chain table management method is: PDCP PDU buffer memory chained list is safeguarded by PDCP and RLC module jointly; Comprise head pointer pPduHeader, first etc. PDCP PDU pointer pPduCur and tail pointer pPduTail to be sent; The nodal information of preserving between pPduHeader～pPduCur is the PDCP PDU that waits for that peers include both is confirmed, the nodal information of preserving between pPduCur～pPduTail such as is at PDCP PDU to be transmitted.
At wireless chain control layer RLC, deletion RLC SDU buffer memory only keeps RLC PDU buffer memory, RLC PDU buffer memory be RLC PDU to be confirmed, and the data that are assembled into RLC PDU obtain from PDCP PDU buffer memory.
RLC can directly fetch data from PDCP PDU buffer memory and be assembled into RLC PDU; And need not be sent to RLC to PDCP PDU through interlayer primitive; RLC also there is no need to distribute buffer memory to store RLC SDU (PDCP PDU), has promptly saved internal memory, has improved the speed of data processing again;
A kind of LTE transmitting uplink data control method of the present invention, transmitting uplink data flow process such as Fig. 4, this flow process be RRC connect to set up be connected with RRC reshuffle completion after, specific descriptions as follows:
Steps A: high-rise module COM is sent to packet data convergence protocol PDCP with IP bag (PDCP SDU), and PDCP converts PDCP SDU into PDCP PDU according to the caching situation of current PDCP PDU; Like step 1A among Fig. 4 and 1B;
Said PDCP is according to the caching situation of current PDCP PDU; Convert PDCP SDU to PDCP PDU: be less than the indication that Nx perhaps receives rlc layer if wait the data total amount of sending out PDU in the PDCP PDU buffer memory; Then convert PDCP SDU into PDCP PDU, Nx is the maximum uplink data sending amount of 2-5 Transmission Time Interval TTI;
Fig. 3 is PDCP PDU schematic diagram data for adopting the chained list way to manage with PDCP SDU data transaction; PDCP PDU data and PDCP SDU data are kept at a slice memory headroom; Data are not handled, and only the data pointer is managed, do not have the data copy; Avoid the dynamic application of internal memory and the copy of data, improved the speed of data processing;
Step B: after medium access control layer MAC receives the ascending resource mandate or feedback UL Grant or PHICH that physical layer is sent; Scan corresponding RLC metadata cache (that is to say the PDCP PDU buffer memory of the PDCP) situation of each logic channel immediately; Add up the outgoing data amount of next transmission opportunity; According to the resource situation of network, be the corresponding resource of each logical channel assignment then, and the respective resources size is reported wireless chain control layer RLC through interlayer primitive; Like the step 2A among Fig. 4,2B, 2C;
The outgoing data amount of said next transmission opportunity of statistics comprises RLC PDU (STATUS PDU) size and the RLC PDU head length degree adding up all RLC SDU that do not send (PDCP PDU) sizes, re-transmission RLC PDU size or retransmit RLC PDU fragment size, sign state.
Step C:RLC receives that MAC reports the interlayer primitive of resource size, according to the metadata cache situation of resource size and this RLC, carries out the assembling of corresponding PDU; Like the step 3 among Fig. 4.
Said corresponding PDU is assembled into: if there is the RLC PDU (STATUS PDU) of sign state to need assembling, then preferentially assemble STATUS PDU, assemble STATUS PDU according to the state report information that RLC preserves; Just assembling retransmits PDU then, retransmits PDU according to retransmission information (RLC PDU buffer memory) assembling; Assemble new biography PDU at last, from PDCP PDU buffer memory, obtain the RLC PDU that RLC SDU is assembled into new biography.
The data of new biography RLC PDU are come the PDCP PDU of pPduCur indication among Fig. 3 freely.
The initial address and the data offset of relevant RLC SDU data only preserved in the assembling of RLC PDU, do not have the copy of data, compared with prior art, saved the data copy time.
Step D:RLC is sent to MAC with the PDU that assembles, and after MAC receives the data on all logic channels, the PDU on each logic channel is assembled into MAC PDU, and fills the MAC head, then MAC PDU is sent to physical layer; Like the step 4A among Fig. 4,4B and 4C;
Step e: after RLC delivers to the MAC layer with RLC PDU, be less than Nx, then indicate the PDCP layer that PDCP SDU is converted into PDCP PDU if wait the data total amount of sending out PDU in the PDCP PDU buffer memory; Wherein Nx is the maximum uplink data sending amount of 2-5 Transmission Time Interval TTI; Like the step 5 among Fig. 4.
Can know by above 5 steps, to PDCP PDU, all adopt data pointer from PDCP PDU to RLC PDU and directly data are not operated from PDCP SDU; The dynamic application of internal memory and the copy of data have been avoided; Improve the speed of data processing, and PDCP SDU buffer memory in the PDCP layer and PDCP PDU buffer memory have been carried out the chained list management, realized the prioritised transmission of IP controlling packet; Reduced the obstruction of data path, thereby guaranteed that the terminal realizes transmitting uplink data fast.
Execution mode that the present invention lifts or embodiment specify the object of the invention, technical scheme and beneficial effect; Should be understood that; Abovely lift execution mode or embodiment is merely preferred implementation of the present invention; Not in order to restriction the present invention, all within spirit of the present invention and principle to any modification that the present invention did, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a LTE transmitting uplink data structure is characterized in that, comprising:
At packet data convergence protocol PDCP, increase PDCP SDU buffer memory, be used to store the also unconverted PDCP SDU IP bag pointer that sends from high level for PDCP PDU; Continue to keep PDCP PDU buffer memory, be used for storage and sent and do not sent PDCP PDU data message, retransmit unacknowledged PDCP PDU when waiting for the affirmation of peer layer or rebuilding the PDCP instance;
At wireless chain control layer RLC, deletion RLC SDU buffer memory only keeps RLC PDU buffer memory, RLC PDU buffer memory be RLC PDU to be confirmed, and the data that are assembled into RLC PDU obtain from PDCP PDU buffer memory.
2. transmitting uplink data structure according to claim 1 is characterized in that, said PDCP SDU buffer memory or PDCP PDU buffer memory adopt the chained list management;
Said PDCP SDU buffer memory chain table management method is: when PDCP receives the IP controlling packet, and with first node of IP controlling packet pointer insertion chained list, the preferential transmission; When PDCP receives the IP packet, then be inserted into after the tail pointer pSduTail of chained list, and upgrade tail index p SduTail; When PDCP need generate PDCP PDU, just the nodal information PDCP SDU that preserves in the chained list is carried out after head compresses, encrypts, adds the PDCP head, be inserted into the end of PDCPPDU buffer memory then, wait to be sent;
Said PDCP PDU buffer memory chain table management method is: PDCP PDU buffer memory chained list is safeguarded by PDCP and RLC module jointly; Comprise head pointer pPduHeader, first etc. PDCP PDU pointer pPduCur and tail pointer pPduTail to be sent; The nodal information of preserving between pPduHeader～pPduCur is the PDCP PDU that waits for that peers include both is confirmed, the nodal information of preserving between pPduCur～pPduTail such as is at PDCP PDU to be transmitted.
3. a LTE transmitting uplink data control method is characterized in that, comprising:
Steps A: high-rise module COM is sent to packet data convergence protocol PDCP with the IP bag, and PDCP converts PDCP SDU into PDCP PDU according to the caching situation of current PDCP PDU;
Said PDCP is according to the caching situation of current PDCP PDU; Convert PDCP SDU to PDCP PDU: be less than the indication that Nx perhaps receives rlc layer if wait the data total amount of sending out PDU in the PDCP PDU buffer memory; Then convert PDCP SDU into PDCP PDU, wherein Nx is the maximum uplink data sending amount of 2-5 Transmission Time Interval TTI;
Step B: after medium access control layer MAC receives the ascending resource mandate or feedback UL Grant or PHICH that physical layer is sent; Scan the corresponding RLC metadata cache situation of each logic channel immediately; Add up the outgoing data amount of next transmission opportunity; According to the resource situation of network, be the corresponding resource of each logical channel assignment then, and the respective resources size is reported wireless chain control layer RLC through interlayer primitive;
The outgoing data amount of said next transmission opportunity of statistics comprises RLC PDU size and the RLC PDU head length degree adding up all the RLC SDU that do not send sizes, re-transmission RLC PDU size or retransmit RLC PDU fragment size, sign state;
Step C:RLC receives that MAC reports the interlayer primitive of resource size, according to the metadata cache situation of resource size and this RLC, carries out the assembling of corresponding PDU;
Said corresponding PDU is assembled into: if there is the RLC PDU of sign state to need assembling, then preferentially assemble STATUS PDU, assemble STATUS PDU according to the state report information that RLC preserves; Just assembling retransmits PDU then, retransmits PDU according to the retransmission information assembling; Assemble new biography PDU at last, from PDCP PDU buffer memory, obtain the RLC PDU that RLC SDU is assembled into new biography;
Step D:RLC is sent to MAC with the PDU that assembles, and after MAC receives the data on all logic channels, the PDU on each logic channel is assembled into MAC PDU, and fills the MAC head, then MAC PDU is sent to physical layer;
Step e: after RLC delivers to the MAC layer with RLC PDU, wait in the PDCP PDU buffer memory that the data total amount of sending out PDU is less than Nx, then indicates the PDCP layer that PDCP SDU is converted into PDCP PDU if judge; Wherein Nx is the maximum uplink data sending amount of 2-5 Transmission Time Interval TTI.
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| CN113453276A (en) * | 2021-05-18 | 2021-09-28 | 翱捷科技股份有限公司 | Method and device for improving utilization rate of uplink and downlink memories of LTE terminal |
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