CN101496335A - Hybrid approach for data transmission using a combination of single-user and multi-user packets - Google Patents

Abstract

A method and system for method for transmitting data in a communication network employing HARQ. The method includes a first step (502) of grouping data to be transported into a first group and a second group in accordance to a decision parameter, such as data size. A next step (504) includes concatenating data from the first group and encoding into a multi-user packet. A next step (502) includes encoding the data into a plurality of data packets. A next step (506) includes assigning available traffic resources to encoded packets. A next step (506) includes transmitting at least a first transmission of the encoded packets. A next step (510) includes reassigning a portion of said traffic resources for which a positive acknowledgement has been determined to uninitiated packets or to assist with one or more ongoing transmissions.

Description

Use the mixed method that is combined into the line data transmission of single user and multi-user grouping

Technical field

The disclosure relates generally to radio communication, relates in particular to scheduled mobile terminals and corresponding method in wireless communication system.

Background technology

In digital cellular communication system, one of prevailing method of the packet data that is used to transmit is used and is known as " single user " grouping.Use single user grouping, expectation is used for single user's data collection and is encoded as single grouping, uses available transmission resources (being Traffic Channel) to be sent to the user of expectation then.In recent years, having seen the second kind of packet type that increases use is the packet type that is known as " multi-user " grouping.Multi-user grouping forms by the data set that a plurality of data sets of each typically being expected be used for different user are linked into an independent bigger multi-user data, and it is encoded into an independent grouping then.An example that uses single user and multi-user to transmit is based on the voice technology (VoIP) of Internet Protocol.

Typically, the size of multi-user data collection equals the individual data collection before coding size sum adds the control information of increase, this control information be used to discern which user have the multi-user in dividing into groups information and they have how much information with and in articulation set residing position.When little data acquisition system need be sent out, use multi-user's grouping of exploitation, its result has advantage.At first, they allow very little grouping to be linked, and are effectively sent in the transfer resource that is designed for bigger grouping dimension.Secondly, they allow the single set of error correction bit and encoder afterbody bit to be used for a group data set, and do not need a plurality of set of these overhead-bits.At last, the bigger grouping dimension that obtains from link process has been realized more effective coding gain.

Usually, in order to improve transmission performance, the technology of mixing automatic repeat requests (HARQ) that is called is used in the transmission process meeting.In the HARQ transmission, access network (AN), perhaps Deng Jia base station sends initial transmission to wireless receiver.Then, it waits for positive acknowledgement (ACK) or Negative Acknowledgement (NAK) indication from wireless receiver.If AN has received NAK, then it repeats to the transmission of wireless receiver or sends extra check information as second transmission to wireless receiver.This process is repeated until that wireless receiver has sent positive acknowledgement, perhaps attempted predetermined maximum number of transmissions and not till the success.Typically, in order all to use the transmission capacity of channel, transmitter can use the concurrent transmission of a plurality of data sets.For example, determined affirmation based on nearest transmission, and should confirm index signal notice transmitter the time, be not idle waiting, but transmitter can start the transmission of second data set that carries out to same or different receivers at receiver.Determine affirmation and notify transmitter in the required time this confirmation signal that in order to guarantee transmitter wait acknowledge no longer idly, transmitter also can start transmission at receiver, to the additional data set of these identical or different receivers transmission.An one example is synchronous hybrid automatic repeat request (S-HARQ) technology of using in current HRPD (high rate packet data) (HRPD) standard, and it has set up one group of four time-division interlaced transmission channels, and this channel can be used for the concurrent transmission of four different pieces of information collection.These interlaced transmission channels are sometimes referred to as " HARQ interweaves ".

Although HARQ has realized improved radio link performance, but it is a certain amount of uncertain that it has also been introduced in the time may obtaining positive acknowledgement for specific data set, but its self introduce itself problem, particularly in data waiting for transmission during for delay-sensitive, i.e. latency issue.

For example, the imagination system is made up of N transfer resource, and these transfer resources are used to use the HARQ technology to U user's transferring voice and other delay-sensitive data.Data set arrives the user of all or certain part based on certain cycle (for example per 20 milliseconds), and through (for example having passed through before next 20 milliseconds) before certain time quantum, each user's data must be passed to the user.(be in the heavy duty system of U＞N), selected initial set as data set begun transmission in that the user is more than transfer resource corresponding to the data set of a subclass of these users.Remaining data set must wait for, up to since one or more receivers successfully confirm, till transfer resource can be used.In case transfer resource can be used, defective can appear in the data set that starts later, because its more late beginning of maximum delay standard than 20 milliseconds, and the number that can be used for its HARQ transmission attempt before the expiration of delay standard is limited.This finally causes capacity lower in such system, because guarantee that in order to keep given quality of service the number of users that begins to postpone to divide into groups to start must be limited.

Therefore, need a kind of method and system of effective use transfer resource, it can alleviate harmful effect of late resource allocation, and is transmitted in the communication system of using HARQ and begins.

Description of drawings

Set forth the characteristics of the present invention that are considered to novel by the feature in the appended claim.In conjunction with the drawings with reference to the following description, can understand the present invention and further purpose and advantage best, in these several accompanying drawings, identical reference number is represented components identical, wherein:

Fig. 1 is the exemplary block diagram of the system of a plurality of embodiment according to the present invention;

Fig. 2 is the exemplary block diagram of the Wireless Telecom Equipment of a plurality of embodiment according to the present invention;

Fig. 3 is the exemplary plot of transmission plan according to an embodiment of the invention;

Fig. 4 is interweave 1 a exemplary plot of illustrative HARQ among Fig. 3;

Fig. 5 is according to the present invention, the exemplary plot of resource allocation algorithm;

Fig. 6 is according to the present invention, is used to notify the exemplary plot of resource allocation message of the current distribution of a plurality of receiver service resources;

Fig. 7 is according to the present invention, corresponding to HARQ interweave 1 first the transmission exemplary plot;

Fig. 8 is according to the present invention, corresponding to HARQ interweave 1 second the transmission exemplary plot;

Fig. 9 is according to the present invention, corresponding to HARQ interweave 1 the 3rd the transmission exemplary plot; And

Figure 10 be corresponding to HARQ interweave 1 the 4th the transmission exemplary plot.

One skilled in the art will recognize that,, be not described in useful or necessary a plurality of general but known elements in the commercial embodiment in order to hinder understanding littlelyr to a plurality of embodiment of these the present invention.

Embodiment

The invention provides a kind of method and system of effective use transfer resource, it has alleviated harmful effect of late resource allocation, and transmission starts from using in the communication system of HARQ.Especially, the present invention is a plurality of packets with described digital coding, and the destination of its each grouping is single or multiple receivers.At least one service resources is assigned to each grouping of having encoded.At least one first transmission of the grouping that each has been encoded is sent out, and also its part that is defined as the service resources of sure affirmation is not reallocated the packets remaining of just transmitting to one or more afterwards.

Advantageously, the less grouping set that the present invention will just transmitted is multi-user's grouping, and this multi-user's grouping is encoded as independent unit then and is used for having minimized the transmission expense.Further, the use of multi-user grouping is dynamically adjusted, to utilize since single user grouping than early stopping and d/d Traffic Channel, thereby maximization efficient coding speed and link performance.

Fig. 1 is the exemplary block diagram of the system 100 of a plurality of embodiment according to the present invention.System 100 can comprise network controller 140, network 110 and one or more wireless receiver 120,122,124,126,128,130 and 132.Wireless receiver 120,122,124,126,128,130 and 132 can be a Wireless Telecom Equipment, for example accesses terminal, radio telephone, cell phone, personal digital assistant, beep-pager, personal computer, mobile communication equipment or any other send on wireless network and the equipment of receiving communication signal.

In an exemplary embodiments, network controller 140 is connected to network 110, and comprises and be used for the processing unit (not shown) and the network interface (not shown) of communicating by letter with for example network 110.Controller 140 can be positioned on the access network (AN), on the radio network controller or any other place on the network 110.Network 110 can comprise the network that can send and receive any kind of wireless signal.For example, network 110 can comprise cordless communication network, cellular phone network, satellite communication network and other similar communication system.In addition, network 110 can comprise a more than network, and can comprise a plurality of networks of different type.Therefore, network 110 can comprise the combination of a plurality of data networks, a plurality of communication network, data and communication network, and other similarly can send the communication system with receiving communication signal.

In operation, network controller 140 can send indication by the wireless receiver 120,122,124,126,128,130 and 132 to time-domain resource, distributes time-domain resource to give wireless receiver 120,122,124,126,128,130 and 132 on Traffic Channel.This Traffic Channel can be any channel that carrying is used for the information of wireless receiver.It can be at least one subchannel, perhaps the subclass of at least one subchannel.Can use any multiple access scheme to define this subclass, for example frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA) or above combination.Network controller 140 can be positioned on the AN, and can use control channel to send indication.It can be the time slot of one or more vicinities that time domain is distributed, and can have the pattern of repetition.

Control channel can be any channel that is used to carry the information of relevant Traffic Channel.Control channel can be with different Walsh (walsh) sign indicating number, in different time slots, in different OFDM (OFDM) symbol time, in the different sets of OFDM subcarrier, be sent out the header of lead code as Traffic Channel, multi-user's grouping, with the combination of beginning a project etc.Control channel can be shared between a plurality of receivers, perhaps is exclusively used in a wireless receiver.Control channel can be sent out with data parallel, perhaps before time slot or before subframe in be sent out.

Fig. 2 is according to a plurality of embodiment of the present invention, such as the exemplary block diagram of the Wireless Telecom Equipment 200 of wireless receiver 120,122,124,126,128,130 or 132.Wireless Telecom Equipment 200 can comprise shell 210, be coupled to the controller 220 of shell 210, be coupled to shell 210 audio frequency input and output circuit 230, be coupled to shell 210 display 240, be coupled to shell 210 transceiver 250, be coupled to shell 210 user interface 260, be coupled to the memory 270 of shell 210 and be coupled to shell 210 and the antenna 280 of transceiver 250.Some processing unit of equipment 200 is commonly referred to the processing unit (not shown).According to present embodiment, this processing unit can comprise some or all of for example controller 220 and memory 270.Wireless Telecom Equipment 200 also can comprise data interface unit 294, is used for receiving and send data from the external data communication equipment that reaches to for example computer.

Display 240 can be that LCD (LCD), light-emitting diode (LED) display, plasma display or any other are used for the device of display message.Transceiver 250 can comprise transmitter and/or receiver.Audio frequency input and output circuit 230 can comprise microphone, loud speaker, frequency converter or any other audio frequency input and output circuit.User interface 260 can comprise keypad, button, touch pad, joystick, additional display or any other for providing the interface useful device user and electric room.Memory 270 can comprise that random access memory, read-only memory, optical memory, subscriber identity module memory or any other can be coupled to the memory of Wireless Telecom Equipment.

In operation, controller 220 can be controlled the operation of Wireless Telecom Equipment.Transceiver 250 can comprise the receiver that is configured to receive control channel.In certain embodiments, controller 220 can be decoded to control channel, broadcast channel, multi-user's grouping etc.When controller found that its unique identifier may be embedded into as control channel, broadcast channel, multi-user's grouping etc. a part of, it can further handle this channel.

This unique identifier can be that mobile communication equipment or the identification code that accesses terminal, user identity or any other can be used for the identifier of unique identification wireless receiver.For example, this unique identifier can be medium access control index (a MAC index).The unique identifier of the distribution found of response, controller 220 then can to the data of grouping or other form or control information be decoded or other processing.

By the best explanation of example notion and method related to the present invention.Note,, also can easily select other value and within the scope of the present invention although following example has been selected specific time slot duration, HARQ interweave number and multiple other parameter.

Fig. 3 is the exemplary plot of transmission plan according to an embodiment of the invention.In this illustrative example, per 20 milliseconds time-domain resource is split into 12 adjacent time slots.These 12 transmission time slots are used to set up one group 3 HARQ then and interweave, and may have maximum 4 transmission attempts on each interweaves.Receiver uses the similar time structure with 1.5 slot offset, and the indication of affirmation is provided, and confirms and send determined affirmation the time is provided to transmit for decoding, to determine.Notice that each HARQ interweaves and can be used for sending different data sets.In addition, each HARQ interweaves and can further be subdivided into N1 independently transfer resource, transmission when being used for N2 independent data sets.

Fig. 4 is interweave 1 a exemplary plot of illustrative HARQ among Fig. 3.Notice that in Fig. 4, HARQ interweave 1 employing code division multiple access, time division multiple access, frequency division multiple access, its combination or any other suitable multiple access scheme further are subdivided into 4 different transfer resources.The transmission of each be exclusively used in different pieces of information collection of these 4 transfer resources.

Fig. 5 is the exemplary plot of possible resource allocation algorithm.Note, though this exemplary algorithm has used the size of various data sets to be sent as determining mechanism, be used for data set grouping and which data set of determining to encode are divided into groups as the multi-user as single user grouping and which data set of coding, but also can use other such as the decision parameter that postpones (latency) demand, data application type, coding method etc., and it fall within the scope of the present invention.Equally, though this exemplary algorithm is redistributed the service resources that discharges by positive acknowledgement from a plurality of user packet transmissions of trend, also can use other allocation rule, and it also within the scope of the invention.

At first step 502, the data size of each transmission, promptly data set independently is examined, and and threshold value, the N2 bit compares.These data sets are grouped into first and second groups according to the size of each data set.For example, first group of those data set that are less than or equal to the N2 bit by size constitutes, and second group is made of size those data sets greater than the N2 bit.Although the decision parameter of Shi Yonging is a data set size in this example, but will be appreciated that this decision parameter can be that delay requirement, data application type, coding method, these combination or any other data set by will be to be made up are separated into multi-user's grouping the more parameter of effective traffic channel utilization is provided.In the example here, less data set (＜=N2) benefit by being linked into multi-user's grouping (step 504), and bigger data set (＞N2) can be used as single user grouping by normal send (step 502).

In either case, send all data sets simultaneously and may make inadequate resource.As a result, the invention provides the service resources that can use to one or more data set packet allocation, 506, and begin to transmit those packets.The packets remaining of data set must be waited for, till service resources can be used, promptly receives till the correct positive acknowledgement that receives of grouping.If receive positive acknowledgement 508, this means that grouping is correctly received, can send another remaining grouping.In this incident, specific service resources is available now, and it can be reallocated to begin new grouping, perhaps helps other to report Negative Acknowledgement or unacknowledged ongoing transmission 510.

If do not receive positive acknowledgement 508, then continue 512 by using current traffic resource assignment profile to carry out another transmission process, it is repeated until till having carried out last possible transmitted in packets attempts 514, so transmission ending 516.

Fig. 6 is the exemplary plot that is used to notify the possible resource allocation message of a plurality of receiver current business resource allocation.Each assignment messages is substantially by the clauses and subclauses that are used for each service resources, and it is identified at the identification code of having distributed the receiver of service resources between current transmission period to it, and perhaps the indicating services resource just is being used to send the clauses and subclauses formation of multi-user's grouping.In Fig. 6, use receiver identification code " 001 " to finish the indication of first multi-user grouping, use receiver identification code " 002 " to finish the indication of second multi-user grouping, use can use receiver sign " 000 " to indicate unappropriated service resources greater than the specific receiver sign of the receiver identification code indication of " 002 ".Notice that each resource allocation message can send on independent Dedicated Control Channel, the part that this message also can be used as the business of transmission is sent out, or both combinations.Be also noted that the type of this resource allocation message also can use other resource allocation message type or form, and it falls within the scope of the present invention only for illustrative purposes.An example of another resource allocation message type that may adopt is that bitmap is represented message, wherein ad-hoc location in the drawings uses one or more bit structure bitmaps to indicate transmission feature, for example distribute to service resources or a plurality of service resources of each receiver, and possible transmission size, code rate perhaps relates to various other parameters of transmission.Notice that the resource allocation message that is used for multi-user's grouping can be similar to form shown in Figure 6 on form, can be that bitmap is represented, perhaps is used for any suitable form of signalisation resource allocation in the multi-user divides into groups.In addition, the resource allocation message that is used for multi-user's grouping can be utilized the information that comprises in other control messages, thereby reduces the size of described multi-user's grouping resources assignment messages.For example, when the possibility of Resources allocation in the multi-user divides into groups has been eliminated in the existence of single user packet transmissions, be assigned with service resources be used for single user packet transmissions receiver can represent to omit from bitmap.

Fig. 7 interweaves 1 corresponding to HARQ, and by the first possible exemplary plot of transmitting of using resource allocation message (610 among Fig. 6) indication.In this illustration, target is that the data set of receiver (120 among Fig. 1) is encoded, and uses service resources 1 to send initial transmission.Target is that the data set of another receiver (122 among Fig. 1) has been encoded, and sends initial transmission on service resources 2.Target is that the data set of another receiver (124 among Fig. 1) has been encoded, and sends initial transmission on service resources 3.At last, target is that the data set of another receiver (126 among Fig. 1) has been encoded, and sends initial transmission on service resources 4.Notice that after finishing first transmission, receiver 126 returns positive acknowledgement (ACK) indication to transmitter, and receiver 120, receiver 122, and receiver 124 provide Negative Acknowledgement (NAK) indication to transmitter.

Fig. 8 interweaves 1 corresponding to HARQ, and uses the exemplary plot of the second possible transmission of resource allocation message (612 among Fig. 6) indication.In this illustration, after receiving positive acknowledgement from receiver 126, when first transmission started for receiver 120,122 and 124, network controller 140 was used for using in the data set transmission for the disabled receiver of its transfer resource (128 among Fig. 1) being redistributed service resources 4.Network controller 140 begins on service resources 1 then to receiver 120 transmission second transmission, on service resources 2, transmit to receiver 122 transmission second, on service resources 3 to receiver 124 transmission second transmission, and on service resources 4 to the initial transmission of receiver 128.As shown in Figure 8, after having finished second transmission, receiver 122 and receiver 124 provide positive acknowledgement (ACK) to transmitter, and receiver 120 and receiver 128 provide Negative Acknowledgement (NAK).

Fig. 9 interweaves 1 corresponding to HARQ, and uses the 3rd possible transmission of resource allocation message (614 among Fig. 6) indication.In this illustration, target is that data set of another receiver (130 among Fig. 1) and data set that target is another receiver (132 among Fig. 1) are linked as suitable multi-user's grouping, and be encoded, network controller 140 has been dispatched first transmission of this multi-user's grouping on service resources 2, it is released after receiving positive acknowledgement from receiver 122.Equally, after receiving positive acknowledgement from receiver 124, network controller 140 is redistributed service resources 3 and is used for using in the single user packet transmissions of startup, to help the transmission of single user grouping that quilt is initiated on the service resources 4 in transmission 2.Network controller 140 then begin on the service resources 1 to receiver 120 the 3rd transmission, on the service resources 2 to first transmission of multi-user's transmitted in packets of receiver 130 and receiver 132, on service resources 3 and service resources 4 to second transmission of receiver 128.Note, in the additional information that offers receiver 128 on the service resources 3 can be the form of the information reproduction that sends on the service resources 4, perhaps it can be different information, the additional parity check bit that obtains by encoding process for example, under the condition that lacks such as the additional service resources of service resources 3, this check digit can be sent out or not be sent out.As shown in Figure 9, after having finished the 3rd transmission, receiver 120, receiver 128 and receiver 130 provide positive acknowledgement (ACK) to transmitter, and receiver 132 provides Negative Acknowledgement (NAK).

Figure 10 interweaves 1 corresponding to HARQ, and uses the exemplary plot of the 4th possible transmission of resource allocation message (616 among Fig. 6) indication.In this illustration, receiving positive acknowledgement from receiver 120, receive positive acknowledgement from receiver 128, after receiving positive acknowledgement from receiver 130, network controller 140 is redistributed service resources 1,3 and 4 and be used for helping multi-user's transmission packets of initiating on the service resources 2 of transmission 3.Network controller 140 begins to transmit to second of receiver 132 transmission multi-user transmitted in packets on service resources 1,2,3 and 4 then.As shown in figure 10, after having finished the 4th transmission, receiver 132 provides positive acknowledgement to transmitter.

The present invention advantageously realizes in VoIP system, for example by effective transmission of voice is provided, perhaps provides other low data service to middle speed in ofdm system.Said method provides the very effective method of this transmission, it has following advantage: a) owing to used the bitmap of packet scheduling and channel allocation to represent, signaling consumption is lower, b) owing to stride across a collection of junction traffic channel that accesses terminal, maximized the resource use, c) utilize single CRC and encoder afterbody surplus (encoder tail allowance) to gather and transmit the Packet Data Unit of minimum owing to used the multi-user to divide into groups, thereby minimized link overhead, it is also with the enhancing from the coding gain of big grouping dimension, and d) because wherein in order to utilize the Traffic Channel that discharges than early stopping by HARQ, the mode that multi-user's block encoding is dynamically adjusted has maximized link performance.

Method of the present disclosure preferably realizes on programmed processor.Yet, also can be, realize this controller, flow process and module such as on the programmable logic device of PLD, PLA, FPGA or PAL etc. at the microprocessor of universal or special computer, programming or microcontroller and peripheral integrated circuit component, ASIC or other integrated circuit, such as the hardware electronic of discrete element circuits and logical circuit.Usually, anyly residently on it can realize that the equipment of the finite state machine of the foregoing description and/or following claim can be used for carrying out functional processor of the present disclosure.

The above-mentioned solution of having described benefit, other advantage and problem about certain embodiments of the present invention.Yet, the solution of this benefit, advantage, problem, and any element that can cause or cause this benefit, advantage or solution, perhaps cause feature or element that the clearer and more definite element of these benefits, advantage or solution can not be configured to strictness, that need or the essence of any or all of claim.Use in the claim as used herein and additional, term " comprises " and changes and is used to represent comprising of non-eliminating, make the processing, method, product or the device that comprise element list not only comprise these elements in the tabulation, also comprising does not have expression or these processing, method, product or installs other intrinsic element in the tabulation.

Term " one " is defined as one or more as used herein.Term " a plurality of " and be defined as two or as used herein more than two.Term " another " and be defined as at least the second or more as used herein.Term " comprises " and/or " having " is defined as comprising (being open language) as used herein.Term " coupling " is defined as connecting as used herein, connects although need not to be directly or mechanically.Term " program ", " computer program " reach " computer instruction " and are defined as command sequence as used herein, and it is designed to carry out on computer system.This command sequence can include but not limited to subprogram, function, order, object method, object realization, can carry out application, small routine (applet), servlet (servlet), share library/dynamic load library, source code, object code and/or assembler code.

Claims (10)

1. method that is used for sending data at the communication network that adopts HARQ, described method comprises step:

With described digital coding is a plurality of packets;

At least one service resources of packet allocation for each coding;

At least send first transmission of described coding groups; And

A part of determining to carry out the described service resources of positive acknowledgement is redistributed the remaining grouping of transmitting to one or more.

2. method according to claim 1, wherein said coding step comprise that with described digital coding be in the group of single user grouping and multi-user grouping at least one.

3. method according to claim 1, wherein said allocation step only indicates to single user grouping to distribute which service resources.

4. method according to claim 1 further may further comprise the steps:

According to the decision parameter, it is first group and second group with packet waiting for transmission; And

Link is from described first group data, and wherein said coding step comprises that the digital coding with described link is multi-user's grouping.

5. method according to claim 1, wherein said allocation step comprise that bitmap represents message, and wherein the ad-hoc location in described figure uses one or more bits to construct bitmap, thus the indication transmission characteristic.

6. system that is used for sending data at the communication network that adopts HARQ, this system comprises:

Data set to be sent;

Network controller, it is a plurality of packets that described network controller can be operated described digital coding, and at least one service resources of packet allocation of each coding; And

Access network, described access network can be operated first transmission that sends described coding groups at least, wherein

Described network controller can be operated the part of the described service resources that will determine to carry out positive acknowledgement and redistribute the remaining grouping of transmitting to one or more.

7. system according to claim 6, wherein said packet is encoded as at least one in the group of single user grouping and multi-user grouping.

8. system according to claim 6, wherein said network controller only indicates to single user grouping to distribute which service resources.

9. system according to claim 6, it is first group and second group with packet waiting for transmission that wherein said network controller can be operated according to the decision parameter, link is from described first group data, and is multi-user's grouping with the digital coding of described link.

10. system according to claim 6 comprises that further bitmap represents message, and wherein the ad-hoc location in described figure uses one or more bits to construct bitmap, thus the indication transmission characteristic.

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