CN101854622B - High-speed uplink packet access terminal and data transmission method thereof - Google Patents
High-speed uplink packet access terminal and data transmission method thereof Download PDFInfo
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Abstract
The invention provides a high-speed uplink packet access terminal and a data transmission method thereof, wherein the method comprises the following steps: in a current TTI, carrying out format selection by using an MAC-e entity in a terminal as an RLC entity; sending a corresponding RLC protocol data unit to the MAC-e entity by the RLC entity according to a format selected result; buffering the RLC protocol data unit sent by the RLC entity by the MAC-e entity; and before the next TTI comes, assembling the buffered RLC protocol data unit into an MAC-e protocol data unit by the MAC-e entity and then sending to a physical layer. The invention can improve the real-time property of the HSUPA business of a terminal side.
Description
Technical field
The present invention relates to 3-G (Generation Three mobile communication system), particularly a kind of high-speed uplink packet access terminal and data transmission method thereof.
Background technology
With respect to high speed downlink packet access (HSDPA) business, high speed uplink packet access (HSUPA) is professional has higher requirement to the disposal ability of terminal, wherein physical layer can take many time to coding, spread spectrum and the modulation of big data quantity, and according to protocol requirement, terminal is receiving scheduling resource to send the shortest be 7 time slots from strengthening uplink physical channel (E-PUCH) data from strengthening absolute grant channel (E-AGCH).
With reference to Fig. 1, the data transmission method in the HSUPA terminal of prior art comprises the steps:
Step 101: the MAC-e entity of end side (strengthens medium access control entity, be responsible for the functional module of HSUPA business in the medium access control entity) after obtaining the transmission indication of physical layer about the HSUPA business, carry out form according to the data volume on physical resource and the RLC entity (radio link control entity) and select, and the result that form is selected sends to the RLC entity;
Wherein, the form selection result is the size of number He each the RLC PDU of RLC PDU waiting for transmission.
Step 102:RLC entity is according to the form selection result, the SDU (service data unit) on upper strata is divided into RLC PDU (protocol Data Unit), and these RLC PDU are sent to the MAC-e entity;
After being assembled into MAC-e PDU, the RLC PDU that step 103:MAC-e entity sends the RLC entity sends to physical layer.
Because the interacting message between each layer need to take a long time, for the not high terminal of disposal ability, be difficult to guarantee that above-mentioned all processes all finish in a Transmission Time Interval (TTI), possible consequence is: the MAC-e entity has obtained enough physical resources but has failed to receive the packet of RLC entity; Perhaps, the MAC-e entity has received enough upper layer datas, and physical resource is expired.These all cause the failure of transfer of data, thereby so that the real-time of HSUPA business can not be guaranteed.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high-speed uplink packet access terminal and data transmission method thereof, to improve the real-time of end side HSUPA business.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
Data transmission method in a kind of high-speed uplink packet access terminal comprises:
In current TTI, the MAC-e entity in the terminal is that the RLC entity carries out the form selection;
Described RLC entity sends to described MAC-e entity according to the form selection result with corresponding rlc protocol data cell;
Described MAC-e entity carries out buffer memory to the rlc protocol data cell that described RLC entity sends;
When next TTI arrived, described MAC-e entity sent to physical layer after the rlc protocol data cell of buffer memory is assembled into the MAC-e protocol Data Unit.
Above-mentioned data transmission method, wherein, described MAC-e entity is that the RLC entity carries out form and selects specifically to comprise:
The prediction physical layer obtains the first data volume in the data volume that next TTI can send;
Calculate in described the first data volume and the described MAC-e entity the poor of the data volume of buffer memory, obtain the first difference;
Determine the number of rlc protocol data cell waiting for transmission and the size of each rlc protocol data cell according to the smaller value in the data volume on the described RLC entity and described the first difference.
Above-mentioned data transmission method, wherein: described RLC entity preferentially sends the high rlc protocol data cell of priority to described MAC-e entity.
A kind of high-speed uplink packet access terminal comprises RLC entity and MAC-e entity, and wherein: described MAC-e entity comprises form selection module, cache module and sending module;
Described form is selected module, is used for selecting for described RLC entity carries out form in current TTI;
Described RLC entity is used for selecting the form selection result of module that corresponding rlc protocol data cell is sent to described MAC-e entity according to described form,
Described cache module is used for the rlc protocol data cell that described RLC entity sends is carried out buffer memory;
Described sending module is used for when next TTI arrives, and sends to physical layer after the rlc protocol data cell of described cache module buffer memory is assembled into the MAC-e protocol Data Unit.
Above-mentioned high-speed uplink packet access terminal, wherein, described form selects module to be further used for:
The prediction physical layer obtains the first data volume in the data volume that next TTI can send;
Calculate in described the first data volume and the described cache module the poor of the data volume of buffer memory, obtain the first difference;
Determine the number of rlc protocol data cell waiting for transmission and the size of each rlc protocol data cell according to the smaller value in the data volume on the described RLC entity and described the first difference.
Above-mentioned high-speed uplink packet access terminal, wherein: described RLC entity preferentially sends the high rlc protocol data cell of priority to described MAC-e entity.
Compared with prior art, the invention has the beneficial effects as follows: the present invention adopts pre-caching mechanism, the MAC-e entity is selected and buffer memory RLC PDU for the RLC entity carries out form in previous TTI, data to buffer memory in a rear TTI send, like this, even for the low terminal of disposal ability, also can guarantee the normal transmission of data, thus real-time that can Effective Raise end side HSUPA business.
Description of drawings
Fig. 1 is the data transmission method flow chart in the HSUPA terminal of prior art;
Fig. 2 is the data transmission method flow chart in the HSUPA terminal of the embodiment of the invention;
Fig. 3 is the structure chart of the HSUPA terminal of the embodiment of the invention;
Fig. 4 is the interacting message schematic diagram in the HSUPA terminal of the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
With reference to Fig. 2, the data transmission method in the HSUPA terminal of the embodiment of the invention comprises the steps:
Step 201: in current TTI, the MAC-e entity in the terminal is that the RLC entity carries out the form selection, and the form selection result is sent to the RLC entity;
Wherein, the form selection result is the size of number He each the RLC PDU of RLC PDU waiting for transmission.
Step 202:RLC entity is according to the form selection result, the SDU on upper strata is divided into RLC PDU, and these RLC PDU are sent to the MAC-e entity;
Step 203:MAC-e entity carries out buffer memory to the RLC PDU that the RLC entity sends;
Step 204: when next TTI arrived, the MAC-e entity sent to physical layer after the RLC PDU of buffer memory is assembled into MAC-e PDU.
Can find out, in order to satisfy the HSUPA business to the requirement of whole terminal capabilities, the embodiment of the invention has proposed the mentality of designing at MAC-e entity buffer memory RLC PDU, like this when each TTI arrives, the MAC-e entity can be assembled into local data (the RLC PDU of buffer memory among the upper TTI) immediately MAC-e PDU and be sent to physical layer, has effectively guaranteed the real-time of HSUPA business.Even the embodiment of the invention for the low terminal of disposal ability, also can guarantee the normal transmission of data by adopting pre-caching mechanism.
Further, when satisfying the professional real-time demand of HSUPA, in order to save memory space, the MAC-e entity only need be preserved enough, and the required data of next TTI transmission get final product, therefore, the MAC-e entity can consider according to the expectation transmitting capacity of the next TTI of physical layer, data volume on the RLC entity and MAC-e the entity factors such as data volume of buffer memory when doing form for the RLC entity and select, based on this, described step 201 specifically comprises:
Step S1, the data volume that the prediction physical layer can send in next TTI obtains the first data volume;
Predict the data volume that physical layer can send according to the transmitting capacity of physical layer in next TTI, the parameter that needs to consider has: terminal class (category), maximal rate, the number of time slots (by the top signaling configuration) that allows to carry out the HSUPA transmission, if non-scheduling service also should be taken pre-assigned physical resource into account.
Illustrate: suppose that terminal category is 3, the number of time slots of configuration is 2, and maximal rate is 0.9, can be according to following formula:
Each parameter concrete meaning is as follows in the formula:
-S
eTransmission block size (size of MAC-e PDU, i.e. the input bit number of physical layer) for the MAC-e transmission;
-R
eOutput bit number for physical layer
-λ
eBe code check;
-Modulation Type refers to modulation system, QPSK=2,16QAM=4;
-Ts Number refers to number of time slots;
-SF is spreading factor;
-N
E-UCCHFor strengthening the number of ascending control channel (E-UCCH), by the top signaling configuration, carried by E-AGCH under the scheduling mode under the non-scheduled mode.
Category is 3 terminal support 16QAM, for predicting maximum transmitting capacity selecting modulation mode 16QAM.For non-scheduled mode, all the other parameters are all known; For scheduling mode, can get SF=1, N
E-UCCH=1, can make R like this
eGet maximum.
Be assumed to be scheduling mode, utilize formula (2), can obtain R
eBe 5564 bits, during in addition substitution publicity (1), for simple operation is got maximal rate, finally can obtain S
eBe 5007.6, inquiry 3GPP 25.321 agreements are about the allocation list of 64 kinds of transformats, and so in fact terminal physical layer can be 4927 bits for the maximum amount of data of MAC-e entity transmission in a TTI.
Step S2 calculates in described the first data volume and the described MAC-e entity the poor of the data volume of buffer memory, obtains the first difference;
Wherein, in the described MAC-e entity the data volume of buffer memory refer to the data volume that in a upper TTI, does not send.Because what calculate that its data volume that can send considers according to the transmitting capacity of physical layer is ideal situation, and in fact may remain (physical resource that distributes such as the scheduling mode lower network is less than pre-estimated value), need deduct this surplus when form is selected so next time.
Step S3 compares the data volume on described the first difference and the RLC entity, obtains smaller value wherein, calculates the size of number He each RLCPDU of RLC PDU waiting for transmission according to the smaller value that gets access to, and form is selected complete.
In addition, whole MAC-e PDU may be formed by the data-reusing on a plurality of logic channels, and therefore, rlc layer preferentially sends the data on the higher logic channel of priority when sending data.
Below introduce the HSUPA terminal that realizes said method.
With reference to Fig. 3, described HSUPA terminal comprises RLC entity and MAC-e entity, and described MAC-e entity comprises form selection module, cache module and sending module, wherein:
Described form is selected module, is used for selecting for described RLC entity carries out form in current TTI;
Described RLC entity is used for selecting the form selection result of module that corresponding rlc protocol data cell is sent to described MAC-e entity according to described form,
Described cache module is used for the rlc protocol data cell that described RLC entity sends is carried out buffer memory;
Described sending module is used for when next TTI arrives, and sends to physical layer after the rlc protocol data cell of described cache module buffer memory is assembled into the MAC-e protocol Data Unit.
Described form selects module to be further used for:
The prediction physical layer obtains the first data volume in the data volume that next TTI can send;
Calculate in described the first data volume and the described cache module the poor of the data volume of buffer memory, obtain the first difference;
Determine the number of rlc protocol data cell waiting for transmission and the size of each rlc protocol data cell according to the smaller value in the data volume on the described RLC entity and described the first difference.
Wherein, described RLC entity preferentially sends the high rlc protocol data cell of priority to described MAC-e entity.
Fig. 4 is the interacting message schematic diagram in the HSUPA terminal of the embodiment of the invention, with reference to Fig. 4, comprising:
Step 401: physical layer sends the HSUPA transmission and is indicated to the MAC-e entity;
When each TTI arrived, physical layer can send the HSUPA transmission and be indicated to the MAC-e entity, for scheduling mode, also carried the physical resource information of scheduling in this transmission indication; For non-scheduled mode, physical resource information is disposed by top signaling.
Step 402:MAC-e entity sends MAC_STATUS_IND message to the RLC entity after receiving HSUPA transmission indication;
MAC_STATUS_IND message is used for the form selection result of reporting MAC-e entity, and at this moment, because the data volume on the RLC entity is unknown, therefore, the form of indicating in this MAC_STATUS_IND message be 0;
After step 403:RLC entity receives MAC_STATUS_IND message, send MAC_STATUS_RSP message to the MAC-e entity;
Because the form of indicating in the MAC_STATUS_IND message is 0, at this moment, the RLC entity does not carry out data and sends, and only responds MAC_STATUS_RSP message to the MAC-e entity, and MAC_STATUS_RSP message is used to refer to the data volume (comprising the data volume on each logic channel) on the RLC entity;
Step 404: when next TTI arrived, physical layer sent the HSUPA transmission and is indicated to the MAC-e entity;
Step 405:MAC-e entity is that the RLC entity carries out the form selection, and sends MAC_STATUS_IND message to rlc layer;
The MAC-e entity is that the RLC entity carries out form when selecting, and needs the data volume of buffer memory (be 0 this moment) of the transmitting capacity of comprehensive physical layer, the data volume (obtaining in the step 403) on the RLC entity and MAC-e entity; The MAC-e entity passes through the MAC_STATUS_IND information reporting to the RLC entity with the form selection result, and wherein, the form selection result is the size of number He each RLCPDU of RLC PDU waiting for transmission.
Step 406:RLC entity sends to MAC-e entity by MAC_DATA_REQ message with corresponding RLC PDU according to the form selection result, and the MAC-e entity carries out buffer memory to corresponding data;
Step 407:RLC entity sends MAC_STATUS_RSP message to the MAC-e entity, carries the data volume (referring to remaining data volume) on the RLC entity in the message;
Step 408: when next TTI arrived, physical layer sent the HSUPA transmission and is indicated to the MAC-e entity;
Step 409:MAC-e entity sends to physical layer after the data assembling of buffer memory is become MAC-e PDU;
In this step, the MAC-e entity selects from buffer memory the data of respective numbers to send according to actual physical resources, the total data in the buffer memory might be sent; Might be the transmitting portion data also, also can remain a part of data (need deduct this surplus when form is selected next time) in the buffer memory.
Step 410:MAC-e entity is that the RLC entity carries out the form selection, and sends MAC_STATUS_IND message to rlc layer;
The MAC-e entity is that the RLC entity carries out form when selecting, and needs the data volume of buffer memory (surplus in the step 409) of the transmitting capacity of comprehensive physical layer, the data volume (obtaining in the step 407) on the RLC entity and MAC-e entity; The MAC-e entity passes through the MAC_STATUS_IND information reporting to the RLC entity with the form selection result, and wherein, the form selection result is the size of number He each the RLC PDU of RLC PDU waiting for transmission.
Step 411:RLC entity sends to MAC-e entity by MAC_DATA_REQ message with corresponding RLC PDU according to the form selection result, and the MAC-e entity carries out buffer memory to corresponding data;
Step 412:RLC entity sends MAC_STATUS_RSP message to the MAC-e entity, carries the data volume (referring to remaining data volume) on the RLC entity in the message.
Above flow process relates to 3 TTI, and in first TTI, the MAC-e entity obtains the data volume on the RLC entity; In second TTI, the MAC-e entity carries out form and selects (wherein will use the data volume on the RLC entity that obtains in first TTI), the data that buffer memory RLC entity sends, and obtain remaining data volume on the RLC entity; In the 3rd TTI, the MAC-e entity sends data, and re-starts form and select after (wherein will use the data volume on the RLC entity that obtains in second TTI) to receive and buffer memory RLC PDU and again obtain remaining data volume on the RLC entity from the RLC entity.
The rest may be inferred, when follow-up TTI arrives, repeats the step that comprises in the 3rd TTI.
Can find out that after initialization was finished, in adjacent two TTI, the data that a rear TTI sends were data of buffer memory in previous TTI.Like this, when each TTI arrives, the MAC-e entity can be assembled into local data (the RLC PDU of buffer memory among the previous TTI) immediately MAC-e PDU and be sent to physical layer, even for the low terminal of disposal ability, also can guarantee the normal transmission of data, effectively guarantee the real-time of HSUPA business.
Simulation test is the result also show, end side is when carrying out the HSUPA business, if use maximum transport format, RLC PDU segmentation required time will account for 40% of whole second layer running time, if this part task is fulfiled ahead of schedule and RLC PDU is buffered in the MAC-e entity, so, will reduce 40% the running time of MAC-e entity.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. the data transmission method in the high-speed uplink packet access terminal is characterized in that, comprising:
In current transmission time interval TTI, the MAC-e entity in the terminal is that the RLC entity carries out the form selection;
Described RLC entity sends to described MAC-e entity according to the form selection result with corresponding rlc protocol data cell;
Described MAC-e entity carries out buffer memory to the rlc protocol data cell that described RLC entity sends;
When next TTI arrived, described MAC-e entity sent to physical layer after the rlc protocol data cell of buffer memory is assembled into the MAC-e protocol Data Unit.
2. data transmission method as claimed in claim 1 is characterized in that, described MAC-e entity is that the RLC entity carries out form and selects specifically to comprise:
The prediction physical layer obtains the first data volume in the data volume that next TTI can send;
Calculate in described the first data volume and the described MAC-e entity the poor of the data volume of buffer memory, obtain the first difference;
Determine the number of rlc protocol data cell waiting for transmission and the size of each rlc protocol data cell according to the smaller value in the data volume on the described RLC entity and described the first difference.
3. data transmission method as claimed in claim 1 or 2 is characterized in that:
Described RLC entity preferentially sends the high rlc protocol data cell of priority to described MAC-e entity.
4. a high-speed uplink packet access terminal comprises RLC entity and MAC-e entity, it is characterized in that: described MAC-e entity comprises form selection module, cache module and sending module;
Described form is selected module, is used for selecting for described RLC entity carries out form in current TTI;
Described RLC entity is used for selecting the form selection result of module that corresponding rlc protocol data cell is sent to described MAC-e entity according to described form,
Described cache module is used for the rlc protocol data cell that described RLC entity sends is carried out buffer memory;
Described sending module is used for when next TTI arrives, and sends to physical layer after the rlc protocol data cell of described cache module buffer memory is assembled into the MAC-e protocol Data Unit.
5. high-speed uplink packet access terminal as claimed in claim 4 is characterized in that, described form selects module to be further used for:
The prediction physical layer obtains the first data volume in the data volume that next TTI can send;
Calculate in described the first data volume and the described cache module the poor of the data volume of buffer memory, obtain the first difference;
Determine the number of rlc protocol data cell waiting for transmission and the size of each rlc protocol data cell according to the smaller value in the data volume on the described RLC entity and described the first difference.
6. such as claim 4 or 5 described high-speed uplink packet access terminals, it is characterized in that:
Described RLC entity preferentially sends the high rlc protocol data cell of priority to described MAC-e entity.
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| CN102172069B (en) * | 2011-04-12 | 2013-11-06 | 华为技术有限公司 | Data stream transmission method and terminal device for high speed uplink packet access |
| WO2011100917A2 (en) * | 2011-04-13 | 2011-08-25 | 华为技术有限公司 | Data stream transmission method and terminal device for high speed uplink packet access |
| CN102348292B (en) * | 2011-09-28 | 2014-04-09 | 电信科学技术研究院 | Data transmission method and device based on MAC (media access control) sublayer and RLC (radio link control) sublayer |
| CN109906646B (en) * | 2016-11-30 | 2021-02-12 | 华为技术有限公司 | Information transmission method, base station and terminal equipment |
| CN113840301A (en) * | 2020-06-08 | 2021-12-24 | 深圳市中兴微电子技术有限公司 | Protocol data unit processing method, device, sending equipment and storage medium |
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| CN1439210A (en) * | 2000-04-07 | 2003-08-27 | 诺基亚有限公司 | Transmission of fixed size protocol data units (PDU) throught the transparent radio link control (RLC) |
| EP1686736B1 (en) * | 2005-01-26 | 2007-03-21 | M-Stack Limited | An improved method for processing traffic data in a wireless communications system |
| CN101197646A (en) * | 2007-12-28 | 2008-06-11 | 北京天碁科技有限公司 | Data transmission method based on HSUPA |
| CN101277250A (en) * | 2007-03-29 | 2008-10-01 | 上海宇梦通信科技有限公司 | Method for reducing retransmission delay time of HSUPA data |
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| CN1439210A (en) * | 2000-04-07 | 2003-08-27 | 诺基亚有限公司 | Transmission of fixed size protocol data units (PDU) throught the transparent radio link control (RLC) |
| EP1686736B1 (en) * | 2005-01-26 | 2007-03-21 | M-Stack Limited | An improved method for processing traffic data in a wireless communications system |
| CN101277250A (en) * | 2007-03-29 | 2008-10-01 | 上海宇梦通信科技有限公司 | Method for reducing retransmission delay time of HSUPA data |
| CN101197646A (en) * | 2007-12-28 | 2008-06-11 | 北京天碁科技有限公司 | Data transmission method based on HSUPA |
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