CN1839635A - Random access communication opportunity method - Google Patents
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- CN1839635A CN1839635A CN 200480024224 CN200480024224A CN1839635A CN 1839635 A CN1839635 A CN 1839635A CN 200480024224 CN200480024224 CN 200480024224 CN 200480024224 A CN200480024224 A CN 200480024224A CN 1839635 A CN1839635 A CN 1839635A
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Abstract
During a random access communication opportunity (12), user equipment (20) utilizes either or both of an adaptive modulation and coding-based communication protocol (26) and an HARQ-based communication protocol (27) to achieve improved performance. This can avoid the need to establish dedicated channels (13) to support the required communications. In one embodiment, a plurality of adaptive modulation and coding-based communication protocols are provided with a given protocol being selected as a function of one or more governing criteria. For example, the protocol can be selected as a function of a quality condition of the communication path, as a function of a memory buffer, and so forth.
Description
Related application
We require the senior interest in the U.S. Provisional Patent Application 60/497,654 of submission on August 25th, 2003.
Technical field
The present invention relates generally to communication, relate more specifically to random access communication opportunity.
Background technology
Various communication protocols have been known in the art.For example, third generation collaborative project (3GPP) carries out for many agreements that wireless communications path uses towards development.The original scope of 3GPP is based on the wireless access technology of global system for mobile communications (GSM) core net of evolution and they supporting (general land wireless access system (UTRA) that promptly comprises frequency division multiplexing and time division multiplexing) but produces whole world application technology standard and the technical report that is used for third generation mobile system.Increased maintenance and the development of scope to comprise GSM technical specification and technical report of 3GPP subsequently, it comprises the wireless access technology (for example, the enhancing data rate (EDGE) of general packet radio service (GPRS) and GSM evolution) of evolution.
The 6th chapter of 3GPP standard 25.214 (reference by reference is contained in this with this standard) part has been described Random Access Channel (RACH) agreement and has been described the physical accidental access procedure particularly.3GPP UMTS standard has been ratified a total process, and this process has been considered variety of protocol/mode of operation, and they are fit to the operant activity in various degree that data packet transmission is required, predict and/or expect.Unfortunately, although be designed in these states support that a state of higher transmission data activity can be said to be relatively more suitable that purpose, but be designed to support that in fact another state than the low transmission rate activity seems to stipulate too strictly, the application for some expectation is so at least.The peak rate of the state in back and total user throughput may be not enough to conform with fully many possible action needs.In addition, under some operating environment at least during this state, the uplink delay performance seem also outdated must be long.
Description of drawings
By being provided at the random access communication opportunity method described in the following detailed description, the needs above having satisfied at least in part especially can be recognized this point when studying in conjunction with the accompanying drawings, in the accompanying drawing:
Fig. 1 comprises the prior art state diagram according to 3GPP UMTS Rel-99, Rel-4 and Rel-5 configuration;
Fig. 2 comprises the block diagram according to the embodiments of the invention configuration;
Fig. 3 comprises schematically illustrating according to the various Random Access Channel message size options of embodiments of the invention configuration;
Fig. 4 comprises the flow chart of configuration according to one embodiment of present invention;
Fig. 5 comprises the flow chart of configuration according to another embodiment of the invention; With
Fig. 6 comprises the flow chart of configuration according to still another embodiment of the invention.
Those skilled in the art will recognize that the description of the element in the accompanying drawing is that they there is no need to draw in proportion for simple and clear.For example, in order to help further to understand various embodiment of the present invention, some size of component among the figure may have been amplified with respect to other elements.In addition, for the ease of clearly being familiar with various embodiment of the present invention, but be not shown in useful or that need, general known elements among the embodiment of viable commercial.
Embodiment
Usually, according to these various embodiment, sometimes can provide a plurality of Enhanced Uplink Dedicated Channel (for example, during the corresponding communication path status) for the user of regulation, so that be used for this user's higher data rate transmission rate communication relatively by the time.At All Other Times, can provide the uplink data transmission (for example, at different respective communication path statuss) of using Random Access Channel (RACH) communication opportunity.According to these embodiment, this random access communication opportunity preferably is characterised in that, based on the communication protocol of mixed automatic repeat request (HARQ) or based on one in the communication protocol of adaptive modulation and coding or both.In a kind of preferable methods, a plurality ofly select the message frame size also to can be used for selectivity to use and use.
According to an embodiment, can use multiple candidate's communication protocol based on adaptive modulation and coding.Subscriber equipment (or base station) can be selected a kind of certain protocol based on various suitable standards.For example, can be at least in part, as detect or the function of the condition of the storage buffering of the quality requirements of determined this communication path of other modes and/or subscriber equipment, select a kind of certain protocol.
So configuration, balance (leverage) random access communication opportunity better is with the reduction that realizes postponing and the raising (comprising the raising of peak-data throughput and overall data throughput) of data throughout.In addition, this improvement can fully or substantially realize that with the compatible mutually mode of existing standard these standards for example are 3GPP technical specifications 25.211 to 25.214 with a kind of.These benefits can cause more effective use of whole communication path itself again, because can satisfy many communication needs than the low transmission active state by what (or a plurality of) performance of use improved, thereby reduce the needs that (or a plurality of) had the mode of operation of higher transmission ability.
Referring now to Fig. 1, have about other details of 3GPP technical specification 25.331 and to help better understand these embodiment.In fact, this standard provides three kinds of basic status 10.First kind of state 11 comprises so-called CELL_PCH/URA_PCH state and mainly serves during the cycle of not transmission activity.Second kind of state 12 comprises so-called CELL_FACH state and sets up dedicated channel and be used for the independent low-level transmission activity of supporting according to the third state 13 with helping.The CELL_FACH state by send with the power level that increases preamble in up link, use random access procedure (comprising improved minute time slot ALOHA agreement), this power level to rise to can and to be used in the acquisition indicator that sends on the acquisition indicator channel by network measuring always confirm till.In the situation of positive acknowledgement, in the end several time slots that are identified preamble are the message frame of 10ms or 20ms through acquisition indicator transmission length afterwards.The third state 13 (so-called CELL_DCH state) is supported by using the more senior transmission activity of dedicated channel.The latter sets up and/or safeguards by reshuffling exchange 14, reshuffles exchange 14 and can comprise CELL_FACH state 12.
These embodiment are usually directed to the modification of CELL_FACH state 12 and use or configuration, so that the random access communication opportunity (and message part of especially this random access procedure) that provides thus of balance better.But, it will be understood by those skilled in the art that these embodiment are actually illustrative, be not that the institute of getting rid of these instructions might use.These replace application and their respective embodiments should be considered in these instructions and this scope of invention.
Referring now to Fig. 2, be suitable for as used herein that subscriber equipment 20 comprises controller 21, it is operably connected to transceiver 22 and for example carries content to allow transmission, and the carrying content for example is a message 23.In a preferred embodiment, transceiver 22 comprises radio receiving-transmitting unit, and this radio receiving-transmitting unit is also compatible mutually with 3GPP standard 25.211 to 25.21.Can certainly utilize other transceiver that is suitable for guaranteeing the compatible operations in selected especially communication system.This subscriber equipment 20 can also comprise storage buffering 24 alternatively, and this is known in the art.For example can utilize this storage buffering 24 to support to carry the useful transmission and/or the reception of content.Subscriber equipment is normally known in the art, and those skilled in the art will recognize that, can also provide other parts and/or performance to satisfy given application.For simplicity with keep clear, being described in this and not relating to about the detail of above-mentioned parts and these optional features.
In a preferred embodiment, subscriber equipment 20 also will comprise following at least one: the mechanism (mechanism) 25 that is used for selecting a message frame size from one group of different messages frame sign, based on the communication 26 of adaptive modulation and coding, and based on the communication protocol of HARQ.Although these parts and/or function also are known in the art, provided other details below, to be suitable for more thoroughly to understand these embodiment.
In this embodiment, random access communication opportunity comprises a wireless access channel mechanism of being made up of two 10 milliseconds of frames, and each is made up of these two frames 15 access slots, and each time slot comprises 5120 chips.
As mentioned above, in one embodiment, controller 21 can insert the message frame 25 of a plurality of different sizes.In 3GPP standard 25.211 to 25.214, provide two kinds of so different big or small message frames; One has 10 milliseconds of duration and another has 20 milliseconds of duration.Preferred embodiment provides at least more than one the option about frame sign.Especially, this embodiment provides the littler frame sign with 3.33 milliseconds of duration in addition.Can realize this 3.33 milliseconds of message frames by using five 0.6667ms time slots.
With reference to Fig. 3, so configuration provides three Random Access Channel message size options 30 to use for controller 21.Each Random Access Channel comprises at least one preamble part 32 (and may more preamble parts 33), the preamble part comprises 4096 chips of each preamble in this embodiment, to support uplink random access procedure and the action according to standard 25.211 to 25.214.The first Random Access Channel message size option 31 provides the message part 34 with minimum length in time.The second Random Access Channel message size option 35 provides the option of the message part with intermediate length duration.And the 3rd Random Access Channel message size option 37 provides the option of the message part with extreme length duration.
So configuration, controller 21 can be selected a given Random Access Channel message size option, more to conform with may requiring of given expection transmission.Can advantageously adopt shorter duration messages frame 34 so that under the certain operations condition, reduce the uplink delay and/or the exchange based on HARQ as described below of being more convenient at least.One of shorter RACH messages option may advantage be, along with message frame length increases, because the channel fading relation, channel condition changes when sending preamble further.Therefore, owing to be than short message, channel-changing seldom when message frame finishes.A kind of coarse power control forms can be thought in the preamble slope (ramping) of adopting in the RACH process, and therefore short RACH message-length means that RACH message is better carried out power to be controlled.
Referring again to Fig. 2, in a preferred embodiment, controller 21 can also insert one or more communication protocols 26 based on adaptive modulation and coding.For example, according to an embodiment, subscriber equipment 20 is supported three kinds of such agreements.The protocol example that may use comprises following several, but is not limited thereto:
-the first can select agreement, comprises binary phase shift keying and various channel coding rate;
-the second can select agreement, comprises Quadrature Phase Shift Keying and various channel coding rate;
The 3rd can select agreement, comprises 8 phase shift keyings and various channel coding rate.
Such selection provides the useful scope of data throughout chance.For example, suppose maximum channel bit rate 480kbps (just, suppose 16 Cyclic Redundancy Check bits and 8 tail bits, 3.33 the pay(useful) load of millisecond message frame can be 960 bits with the R=0.615 coding), the various exemplary available random access channel message field that is used for binary phase shift keying and Quadrature Phase Shift Keying has been shown in table 1.In addition, the random accessing message control field has been shown in the table 2.The control field bit carries pilot tone and transport format combination indicator (TFCI) field.(in these two tables, " SF " refers to " spreading factor ".)
Table 1. random accessing message data field
| Time slot format #i | Channel bit rate (kbps) | Modulation | Channel symbol speed (ksps) | SF | Bit/frame | Bit/time slot | The N data |
| 0 | 15 | BPSK | 15 | 256 | 150 | 10 | 10 |
| 1 | 30 | | 30 | 128 | 300 | 20 | 20 |
| 2 | 60 | BPSK | 60 | 64 | 600 | 40 | 40 |
| 3 | 120 | BPSK | 120 | 32 | 1200 | 80 | 80 |
| 4 | 240 | QPSK | 120 | 32 | 2400 | 160 | 160 |
| 5 | 480 | QPSK | 240 | 16 | 4800 | 320 | 320 |
Table 2. random accessing message control field
| Time slot format #i | Channel bit rate (kbps) | Modulation | Channel symbol speed (ksps) | SF | Bit/frame | Bit/time slot | The N pilot tone | NTFCI |
| 0 | 15 | BPSK | 15 | 256 | 150 | 10 | 8 | 2 |
| 1 | 30 | | 30 | 128 | 300 | 20 | 12 | 8 |
Convolutional encoding is used in supposition above.Can realize higher effective load size by using Turbo code.
But when a plurality of this communication protocol times spent based on adaptive modulation and coding, controller 21 can be configured to select a certain protocol so that satisfy the needs of given application best or adapt to given operating condition or environment best.In order to illustrate, and referring now to Fig. 4, this controller can be configured to from a plurality of candidate's adaptive modulation and coding schemes to select 41 1 given 42 selected schemes of using when selecting agreement and being used for during random access procedure the given message of emission then.
A kind of like this selection can be based on one or more standards that may be relevant with given application.For example, and referring now to Fig. 5, controller can determine 51 wireless communications paths quality requirements and based on the selection of the given communication protocol of adaptive modulation and coding at least in part based on this quality requirements.Can determine quality in every way.For example, the difference that transmits and receives between the power level of Common Pilot Channel (CPICH) can be used for determining uplink channel quality.Can on FACH, broadcast the transmitted power level of CPICH easily.As simple explanation, when communication path shows high-quality, can select the agreement of high throughput.On the contrary, when communication path showed poor quality, controller 21 can be selected lower throughput agreement.
As another example, and, can determine the current or anticipated conditions of 61 subscriber device stores buffering, and select 62 concrete agreements as the function of this condition at least in part referring now to Fig. 6.In order to illustrate, low or empty buffer occupancy condition may make agreement select the lower throughput agreement of deflection.Similarly, higher buffering occupancy condition may prove that the higher relatively throughput agreement of selection is correct.
Certainly adopt other standards of the needs conform with particular system, environment and application, requirement, sensitivity.
In packet data communication system, use automatic repetitive requests (ARQ) scheme.Chase has proposed the hybrid ARQ scheme of simple form.The basic thought of Chase scheme be send a large amount of repetitions of each coded data packet and allow decoder before decoding combination by the reception copy of a plurality of coding groups of SNR weighting.This method provides diversity gain and very simply just can realize.Can also use Turbo code to improve the efficient of hybrid ARQ scheme.Do not send the simple repetition of coded data packet, the substitute is, the hybrid ARQ of this form sends progressive (progressive) parity packet corresponding to R=3/4,1/2, code rate such as 1/3, promptly in each transmitted in packets subsequently, increases code rate.The hybrid ARQ scheme of this form is called incremental redundancy (IR).
Referring again to Fig. 2, as said in the early time, in a preferred embodiment, controller 21 can also insert at least one communication protocol based on HARQ.So configuration, controller 21 can be used based on the scheme of HARQ and use the communication resource to send message during the part of access at random of the CELL_FACH of communication resource state.Current known various HARQ schemes (and also may in other scheme of future development) and these schemes are considered to conform to these instructions.In order to illustrate, controller 21 may use based on the communication protocol of incremental redundancy HARQ or based on the communication protocol (about these two kinds of HAQR methods, being known in the art) of chase type HARQ.In one embodiment, controller 21 only can use a kind of HARQ agreement.According to another method, a plurality of HARQ agreements are provided, select a given agreement that conforms with current needs and/or current operating condition most.
The use of HARQ agreement will be typically inevitable with the needs that allow acknowledge message.Can address that need in every way.For example, 3GPP standard 25.211 can provide in the down link acquisition indicator channel and confirm that field is used to send the preamble affirmation partly of RACH.If desired, this field can be used for the HARQ acknowledge message.Particularly, can distribute current untapped 1024 chips to give this affirmation function (preferably may use the power higher to send this affirmation) to improve reception reliability than acquisition indicator part.As another example, can also on independent acquisition indicator channel, send this affirmation (for example, can use lower power channel (for example, being characterised in that 4096 chips)) for this purpose.
According to these different embodiment, strengthened the up link that in aforesaid 3GPP standard, defines at present considerably.Particularly, provide the performance of CELL_FACH state to strengthen the peak rate of transfer of data and greatly reduce the delay of up link.We also expect to realize higher sector and user grouping call throughput.Although these advantages are arranged, under the situation of only existing relevant criterion being carried out minimum change, just can realize these embodiment.
Those skilled in the art will recognize that, under the situation that does not break away from the spirit and scope of the present invention, can make a large amount of modifications, distortion and combination, and this modification, distortion and combination should be regarded in the scope of the inventive concept as the above embodiments.
Claims (14)
1. method of using for communication path comprises:
-often for designated user provides a plurality of dedicated channels, to help the higher data transmission rate communication of these designated users;
-provide random access communication opportunity in some times except above-mentioned a plurality of dedicated channel is provided at least, wherein said random access communication opportunity comprise following at least one:
-based on the communication protocol of HARQ; And
-based on the communication protocol of adaptive modulation and coding.
2. method as claimed in claim 1, wherein said random access communication opportunity is corresponding to the message part of random access procedure.
3. method as claimed in claim 1, wherein said random access communication opportunity comprise improved minute time slot ALOHA agreement.
4. method as claimed in claim 1, wherein said communication path to small part comprises wireless communications path.
5. method as claimed in claim 1, wherein said random access communication opportunity further comprise the use of the message frame selected of a plurality of different sizes.
6. method as claimed in claim 5, the message frames selected of wherein said a plurality of different sizes comprise at least the duration be approximately 3.33 milliseconds first can select frame, duration be approximately 10.0 milliseconds second can select frame, and the duration be approximately 20.0 milliseconds the 3rd can select frame.
7. method as claimed in claim 1, wherein said communication protocol based on adaptive modulation and coding further comprise a plurality of uses of selecting to modulate with coding protocol.
8. method as claimed in claim 7, wherein said a plurality of modulation and coding protocols selected comprise at least:
-comprise that first of binary phase shift keying and various channel coding rate can select agreement;
-comprise that second of Quadrature Phase Shift Keying and various channel coding rate can select agreement; And
-comprise that the 3rd of 8 phase shift keyings and various channel coding rate can select agreement.
9. method as claimed in claim 1, and further comprise at least in part as the function of the quality requirements of communication path, specific communication protocol selected based on adaptive modulation and coding.
10. method as claimed in claim 1, and further comprise at least in part as the function of the condition of the storage buffering of particular communication unit, specific communication protocol selected based on adaptive modulation and coding.
11. one kind is used to use random access procedure to utilize the communication resource during random access communication opportunity so that transmission comprises the method for the message of carrying content, comprises:
-specific adaptive modulation and coding the scheme of selection from a plurality of candidate's adaptive modulation and coding schemes;
-use described specific adaptive modulation and coding scheme during the random access communication opportunity of the described communication resource by using the described communication resource to send this message.
12. as the method for claim 11, wherein said a plurality of candidate's adaptive modulation and coding methods comprise at least:
-comprise that first of binary phase shift keying and various channel coding rate can select agreement;
-comprise that second of Quadrature Phase Shift Keying and various channel coding rate can select agreement; And
-comprise that the 3rd of 8 phase shift keyings and various channel coding rate can select agreement.
13. as the method for claim 11, wherein select specific adaptive modulation and coding scheme to comprise at least in part, select described specific adaptive modulation and coding scheme as the function of the quality requirements of the described communication resource.
14. as the method for claim 11, wherein select specific adaptive modulation and coding scheme to comprise at least in part, select described specific adaptive modulation and coding scheme as the function of the buffer condition of particular communication unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US49765403P | 2003-08-25 | 2003-08-25 | |
| US60/497,654 | 2003-08-25 | ||
| US10/919,920 | 2004-08-17 |
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| CN1839635A true CN1839635A (en) | 2006-09-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162554A (en) * | 2015-09-14 | 2015-12-16 | 北京理工大学 | Real-time decoding method and device in coding time-slot ALOHA system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162554A (en) * | 2015-09-14 | 2015-12-16 | 北京理工大学 | Real-time decoding method and device in coding time-slot ALOHA system |
| CN105162554B (en) * | 2015-09-14 | 2018-04-13 | 北京理工大学 | Real-time interpretation method and device in a kind of coding slotted ALOHA system |
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