CN101400150A - Random access method for multi-carrier TD-SCDMA system - Google Patents
Random access method for multi-carrier TD-SCDMA system Download PDFInfo
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Abstract
The invention provides a random access method of a multicarrier TD-SCDMA system, comprising: a network side configurates an up pilot channel and a fast physical access channel on at least one carrier, configurates a random access channel on at least one carrier, and transmits the configurating result to the mobile terminal, which receives and stores the configurating result; through the up pilot channel and the fast physical access channel, random access is performed between the network side and the mobile terminal, and up synchronization is built; after building the up synchronization, the mobile terminal selects one transmitting random access channel in the carrier configurated with the random access channel, to transmit the up data; and the network side receives the random access channel and performs corresponding process. Therefore, random access channel transmission is performed on assistance carriers, avoiding interference of UpPCH on the assistance carriers.
Description
Technical field
The present invention relates to wireless telecommunication system, more specifically, relate to the accidental access method in multi-carrier time-division synchronous code division multiple access (TD-SCDMA) communication system.
Background technology
In order to satisfy the ever-increasing demand in mobile communication market, enlarge power system capacity, in the TD-SCDMA system, introduce same sectors/cells and carried out overloading soverlay technique frequently, and overloading frequency technology.In overloading frequency technology, a plurality of carrier waves that multi-carrier district comprises.A carrier wave in a plurality of carrier waves is a main carrier, and other carrier wave is auxilliary carrier wave.Only set up on main carrier and use all or part of common signal channel, wherein, the common signal channel PRACH (Physical Random Access Channel) that is used for inserting at random is only configuration and using on main carrier also.
In the random access procedure of TD-SCDMA system, except Physical Random Access Channel, also need to use UpPCH (ascending pilot channel) and FPACH (physical access channel) channel.In above-mentioned TD-SCDMA overloading frequency technology, the physical channel that relates in the random access procedure is all at same carrier wave---on the main carrier.
In random access procedure, UE at first launches the UpPCH channel.In this process, UE need select a uplink synchronous code and at random on UpPTS time slot (uplink pilot time slot) emission opportunity, wherein, a plurality of UE go synchronous code (SYNC_UL) and may clash during opportunity in the emission of UpPTS time slot in the choice, thereby cause the random access procedure failure, therefore, this process is the essential place of random access procedure, and this selection course has embodied a concentrated reflection of the uplink common channel resource in the random access procedure subsequently---the shared method of salary distribution of competition of Physical Random Access Channel (PRACH).Then, UE monitors and receives the FPACH channel.If not conflict of UE emission UpPCH channel, then the NodeB of network side is after receiving uplink synchronous code, assess the timing of its reception, and the timing adjusted value when producing UE next time up emission, send to UE by the FPACH channel then, after UE receives FPACH, will adjust its upstream synchronous timing according to this adjusted value, thereby make UE set up uplink synchronous.UE launches the PRACH channel then, to send upstream data.
And in the up enhancing (EnhancedUplink) or E-DCH technology in present TD-SCDMA system, introduced, having introduced another inserts at random, be that up enhancing inserts at random, perhaps being referred to as E-RUCCH inserts at random, relevant Physical Random Access Channel is E-RUCCH (up enhancing inserts ascending control channel at random), inserts at random and the access at random of above-mentioned PRACH channel is referred to as PRACH.It is identical that the random access procedure of E-RUCCH and PRACH insert at random, relates to UpPCH and FPACH channel equally, inserts the state that inserts at random with E-RUCCH at random but UE carries out PRACH, and the processing method the when content of transmission and Node B receive is different.PRACH inserts at random usually and carries out at non-single user state (non-CELL _ DCH state), and E-RUCCH inserts at random and carries out at single user state (CELL_DCH state) usually; PRACH transmission RACH transmission channel, Node B receive the back and send to RNC with the form of transmission channel, the E-RUCCH transmission be up enhancing schedule information, Node B is received in wherein the MAC-e/es entity and handles.
In random access procedure, UE emission UpPCH and to receive FPACH be in order to set up uplink synchronous and to carry out power control, real content sends by emission Random Access Channel PRACH and E-RUCCH.Usually, in the implementation method of above-mentioned random access procedure, the UpPCH in random access procedure, FPACH and PRACH or E-RUCCH are on identical carrier wave, and promptly uplink synchronous is set up to be transmitted on the identical carrier wave with Random Access Channel and carried out.Frequently in the TD-SCDMA system,, then need on a plurality of carrier waves, distribute and launch UpPCH, FPACH and PRACH or E-RUCCH channel in described overloading if insert at random in a plurality of carrier frequency supports.In the frame structure of TD-SCDMA system, UpPCH corresponds to the UpPTS time slot usually, as shown in Figure 1.Overloading UpPTS frequently transmits and receives, and itself can receive very big interference, the especially interference of TS0 (time slot 0) and DwPTS time slot (descending pilot frequency time slot), and in order to solve the complexity that this interference can increase system.
Frequently in the TD-SCDMA system, adopted the UpPCHShifting technology to solve the interference problem of the UpPCH on the main carrier in existing overloading.And in above-mentioned overloading frequently in the TD-SCDMA system, it is identical that a plurality of carrier waves in sub-district normally cover, and emission is regularly identical, therefore, for uplink synchronous, if UE has set up uplink synchronous on a carrier wave, then for other carrier wave in the same sub-district, up also is synchronous.To carry out the Random Access Channel emission on the auxilliary carrier wave in order being supported in, to avoid the interference problem of the UpPCH on the auxilliary carrier wave simultaneously again, the present invention will provide a kind of uplink synchronous to set up and Random Access Channel is transmitted in the accidental access method that carries out on the different carrier.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is, a kind of accidental access method of multi-carrier TD-SCDMA system is provided, and multi-carrier TD-SCDMA system comprises network side and portable terminal, and it comprises:
Network side simultaneously collocating uplink pilot channel and physical access channel at least one carrier wave, allocating random access channel at least one carrier wave, and configuration result sent to portable terminal, portable terminal receives also preserves configuration result;
By ascending pilot channel and physical access channel, between network side and portable terminal, insert at random, and set up uplink synchronous;
After having set up uplink synchronous, of selecting to have disposed in the carrier wave of Random Access Channel of portable terminal sends Random Access Channel, to send upstream data; And
Network side receives Random Access Channel and carries out respective handling.
Insert at random and can comprise: portable terminal has disposed at least one carrier wave of ascending pilot channel and physical access channel one at the same time and has gone up to network side and send ascending pilot channel, network side receiving after from the ascending pilot channel of portable terminal on same carrier wave to portable terminal transmission physical access channel; And portable terminal is set up uplink synchronous receive physical access channel from network side on the carrier wave identical with the carrier wave that sends ascending pilot channel after.
Network side can comprise radio network controller and Node B.
This accidental access method can also be included in network side, disposes physical access channel and Random Access Channel by radio network controller to Node B, and/or ascending pilot channel, and Node B is preserved configuration result.
This accidental access method can also be included in network side, and by the ascending pilot channel of Node B mobile terminal receive transmission, and to portable terminal emission physical access channel, portable terminal sends Random Access Channel then, and Node B receives also and handles.
For many physical access channel on the carrier wave, the uplink synchronous code numbering mould physical access channel bar number that Node B and portable terminal are launched on ascending pilot channel according to portable terminal selects wherein one to transmit and receive.
Configuration result can system information the mode of form by broadcasting send to portable terminal.
Random Access Channel can insert ascending control channel at random for Physical Random Access Channel and up enhancing.
Physical Random Access Channel on each carrier wave and up enhancing insert ascending control channel at random can share code channel, wherein, determine to be to use the Physical Random Access Channel access also to be to use up enhancing to insert the ascending control channel access at random by uplink synchronous code being configured to two types.
Can on one or more carrier wave, dispose one or more physical access channel, and configuration one or more Physical Random Access Channel on identical and/or different carrier waves, wherein, article one, Random Access Channel is associated with a physical access channel on the carrier wave, and/or be associated with many physical access channel on a plurality of carrier waves, a physical access channel is associated with one or more Physical Random Access Channel.
Frame that can be when receiving physical access channel or subframe numbers select with the corresponding Physical Random Access Channel of physical access channel in one be used to send upstream data.
By technique scheme as can be seen, by separate configurations uplink synchronous channel resource (UpPCH channel and FPACH channel) and random access resource, UE independently carries out the emission of uplink synchronous and Random Access Channel, makes UE can carry out uplink synchronous foundation and Random Access Channel emission on different carrier waves.Thereby be supported in existing overloading frequently in the TD-SCDMA system, UE can carry out uplink synchronous at main carrier and set up, and carries out the Random Access Channel emission on auxilliary carrier wave, has avoided the interference of the UpPCH on the auxilliary carrier wave simultaneously again.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 shows the structure chart of TD-SCDMA radio frames in the prior art;
Fig. 2 shows the schematic diagram according to TD-SCDMA of the present invention system;
Fig. 3 shows the flow chart according to the accidental access method of multi-carrier TD-SCDMA system of the present invention;
Fig. 4 shows the schematic diagram that inserts at random according to the multi-carrier TD-SCDMA system of first embodiment of the invention; And
Fig. 5 shows the schematic diagram that inserts at random according to the multi-carrier TD-SCDMA system of second embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Below in conjunction with accompanying drawing, describe embodiments of the invention in detail.
Fig. 2 shows the schematic diagram according to TD-SCDMA of the present invention system.
With reference to Fig. 2, the network side of existing TD-SCDMA comprises radio network controller (RNC) and Node B (Node B), and portable terminal is UE, and RNC is connected by Iub interface with Node B, and Node B is connected by wireless Uu interface with UE.
With reference to Fig. 3, a kind of accidental access method of multi-carrier TD-SCDMA system is provided, multi-carrier TD-SCDMA system comprises network side and portable terminal, it comprises:
Step S302, network side simultaneously collocating uplink pilot channel and physical access channel at least one carrier wave, allocating random access channel at least one carrier wave, and configuration result sent to portable terminal, portable terminal receives also preserves configuration result;
Step S304 by ascending pilot channel and physical access channel, inserts at random between network side and portable terminal, and sets up uplink synchronous;
Step S306, after having set up uplink synchronous, of selecting to have disposed in the carrier wave of Random Access Channel of portable terminal sends Random Access Channel, to send upstream data; And
Step S308, network side receives Random Access Channel and carries out respective handling.
Insert at random and can comprise: portable terminal has disposed at least one carrier wave of ascending pilot channel and physical access channel one at the same time and has gone up to network side and send ascending pilot channel, network side receiving after from the ascending pilot channel of portable terminal on same carrier wave to portable terminal transmission physical access channel; And portable terminal is set up uplink synchronous receive physical access channel from network side on the carrier wave identical with the carrier wave that sends ascending pilot channel after.
Network side can comprise radio network controller and Node B.
This accidental access method can also be included in network side, disposes physical access channel and Random Access Channel by radio network controller to Node B, and/or ascending pilot channel, and Node B is preserved configuration result.
This accidental access method can also be included in network side, and by the ascending pilot channel of Node B mobile terminal receive transmission, and to portable terminal emission physical access channel, portable terminal sends Random Access Channel then, and Node B receives also and handles.
For many physical access channel on the carrier wave, the uplink synchronous code numbering mould physical access channel bar number that Node B and portable terminal are launched on ascending pilot channel according to portable terminal selects wherein one to transmit and receive.
Configuration result can system information the mode of form by broadcasting send to portable terminal.
Random Access Channel can insert ascending control channel at random for Physical Random Access Channel and up enhancing.
Physical Random Access Channel on each carrier wave and up enhancing insert ascending control channel at random can share code channel, wherein, determine to be to use the Physical Random Access Channel access also to be to use up enhancing to insert the ascending control channel access at random by uplink synchronous code being configured to two types.
Can on one or more carrier wave, dispose one or more physical access channel, and configuration one or more Physical Random Access Channel on identical and/or different carrier waves, wherein, article one, Random Access Channel is associated with a physical access channel on the carrier wave, and/or be associated with many physical access channel on a plurality of carrier waves, a physical access channel is associated with one or more Physical Random Access Channel.
Frame that can be when receiving physical access channel or subframe numbers select with the corresponding Physical Random Access Channel of physical access channel in one be used to send upstream data.
Fig. 4 shows the schematic diagram that inserts at random according to the multi-carrier TD-SCDMA system of first embodiment of the invention.
As shown in Figure 4, be example: main carrier, auxilliary carrier wave 1 and auxilliary carrier wave 2 with one 3 carrier wave TD-SCDMA multi-carrier district.Only at main carrier configuration UpPCH channel and FPACH channel.Insert at random and comprise that PRACH inserts at random with E-RUCCH and insert at random,, all dispose PRACH channel and E-RUCCH channel on auxilliary carrier wave 1 and the auxilliary carrier wave 2 at main carrier.UE can only carry out uplink synchronous and set up on main carrier, but can launch Random Access Channel on main carrier or auxilliary carrier wave.Comprise the steps:
Step 1, RNC disposes UpPCH channel and FPACH channel resource on main carrier, at main carrier, all dispose PRACH channel and E-RUCCH channel resource on auxilliary carrier wave 1 and the auxilliary carrier wave 2, and send to UE by Node B in the mode of broadcasting with the form of system information.In UE reception and the saved system information these insert relevant configuration information at random; RNC also sends to Node B with above-mentioned configuration information simultaneously, and Node B also preserves these information;
RNC is when the above-mentioned random access resource of configuration, FPACH on the main carrier, PRACH on each carrier wave and E-RUCCH can dispose many, every PRACH on each carrier wave and E-RUCCH is unique is associated with a FPACH, and many PRACH on FPACH and a plurality of carrier waves or E-RUCCH are associated.Wherein, PRACH on each carrier wave and E-RUCCH channel can be shared code channel, and in order to support this function, RNC need be configured to uplink synchronous code two classes, are used for distinguishing PRACH and insert at random with E-RUCCH and insert at random.
As shown in Figure 4, disposed 2 FPACH on the main carrier, and main carrier, on auxilliary carrier wave 1 and the auxilliary carrier wave 2 each self-configuring 8 PRACH and E-RUCCH but share 8 code channels.The 1st～4 PRACH and E-RUCCH on each carrier wave are associated with the 1st FPACH, and the 5th～8 is associated with the 2nd FPACH.
Step 2, UE launches the UpPCH channel on main carrier, and Node B receives the UpPCH channel on main carrier, and selects a FPACH channel to send to UE on main carrier, inserts request at random with response;
Owing to disposed 2 FPACH channels on the main carrier, so Node B need select a FPACH channel to send access request response at random to UE.Can adopt with existing TD-SCDMA system in identical method, promptly select by uplink synchronous code numbering (0～7) mould FPACH bar number that UE launches on the UpPCH channel.Therefore, if UE send the time numbering even number uplink synchronous code, then select article one, otherwise select second.
In the present embodiment, select article one FPACH channel, shown in solid line among Fig. 4.
Step 3, UE receives the FPACH channel on main carrier, set up uplink synchronous, and selects PRACH or E-RUCCH channel on the auxilliary carrier wave 2 to send upstream data;
Owing to disposed 2 FPACH channels on the main carrier, identical method was monitored a FPACH when UE need adopt with Node B transmission FPACH channel, and received access request response message at random.UE adjusts upstream synchronous timing according to up emission timing adjusted value wherein then, sets up uplink synchronous.
Then, UE can be according to network side configuration and/or the measurement of himself, and consider the purpose that inserts at random, select a carrier wave, and, select a PRACH or E-RUCCH channels transmit upstream data according to the incidence relation of PRACH on the FPACH that receives on the main carrier and this carrier wave or E-RUCCH channel.Because a FPACH is associated with 4 PRACH channels, therefore, UE need therefrom select one.Can adopt with existing TD-SCDMA system in identical method, promptly the subframe numbers when receiving FPACH is selected.
In the present embodiment, UE is chosen in emission PRACH channel on the auxilliary carrier wave 2, and further selects second PRACH channel to send the RACH transport channel data, shown in solid line among Fig. 4.
Step 4, Node B receives Random Access Channel and handles accordingly on corresponding carriers;
For the Random Access Channel on each carrier wave, Node B is that needs receive and handles.For receiving Random Access Channel at every turn, if PRACH and E-RUCCH Channel Sharing code channel, Node B need insert the uplink synchronous code of use and synchronous code configuration information at random according to this and distinguish that PRACH inserts at random or E-RUCCH inserts at random; Insert at random for every kind, Node B can also carry out different processing according to the carrier wave difference that inserts the place at random.
As in the present embodiment kind, the PRACH that receives UE at auxilliary carrier wave 2 inserts at random, and then Node B sends to RNC with RACH transmission channel wherein.
Fig. 5 shows the schematic diagram that inserts at random according to the multi-carrier TD-SCDMA system of second embodiment of the invention.
As shown in Figure 5, be example with one 6 carrier wave TD-SCDMA multi-carrier district: main carrier, auxilliary carrier wave 1 is to auxilliary carrier wave 5.At main carrier and auxilliary carrier wave 3,4,5 configuration UpPCH channel and FPACH channels.Insert at random and comprise that PRACH inserts at random with E-RUCCH and insert at random that at main carrier, auxilliary carrier wave 1 all disposes PRACH channel and E-RUCCH channel to auxilliary carrier wave 5.UE can only carry out uplink synchronous and set up on main carrier and auxilliary carrier wave 3,4,5, but can launch Random Access Channel on main carrier or all auxilliary carrier waves.Step is similar to Example 1, wherein:
As shown in Figure 5, all disposed 1 FPACH on main carrier and the auxilliary carrier wave 3,4,5, and on main carrier and all auxilliary carrier waves each self-configuring 4 PRACH and E-RUCCH but share 4 code channels.The 1st～4 PRACH on each carrier wave and E-RUCCH this 1 FPACH are associated.
UE is chosen in emission UpPCH channel on the auxilliary carrier wave 4, and Node B receives the UpPCH channel and launches the FPACH channel and give UE on auxilliary carrier wave 4, responds the request of access at random of this UE.
UE receives the FPACH channel on auxilliary carrier wave 4, set up uplink synchronous.UE wishes to dispatch the HSUPA transmission according to measuring on auxilliary carrier wave 2, therefore be chosen on the auxilliary carrier wave 2 and launch E-RUCCH, and further select the 4th E-RUCCH channel to send dispatch request information to Node B.
Node B receives the dispatch request information of UE in the E-RUCCH channels transmit on auxilliary carrier wave 4, dispatch request information is transmitted to the MAC-e entity of Node B inside, and the MAC-e entity is UE allocation schedule HSUPA transfer resource on auxilliary carrier wave 2.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the accidental access method of a multi-carrier TD-SCDMA system, described multi-carrier TD-SCDMA system comprises network side and portable terminal, it is characterized in that, comprising:
Described network side is while collocating uplink pilot channel and physical access channel at least one carrier wave, allocating random access channel at least one carrier wave, and configuration result sent to described portable terminal, described portable terminal receives also preserves described configuration result;
By described ascending pilot channel and described physical access channel, between described network side and described portable terminal, insert at random, and set up uplink synchronous;
After having set up uplink synchronous, of selecting to have disposed in the carrier wave of described Random Access Channel of described portable terminal sends described Random Access Channel, to send upstream data; And
Described network side receives described Random Access Channel and carries out respective handling.
2. the accidental access method of multi-carrier TD-SCDMA system according to claim 1 is characterized in that, the described access at random comprises:
Described portable terminal has disposed in described at least one carrier wave of described ascending pilot channel and described physical access channel one at the same time and has gone up and send described ascending pilot channel to described network side, and described network side sends described physical access channel to described portable terminal on same carrier wave after the described ascending pilot channel that receives from described portable terminal; And
Described portable terminal is set up uplink synchronous receive described physical access channel from described network side on the carrier wave identical with the described carrier wave that sends described ascending pilot channel after.
3. the accidental access method of multi-carrier TD-SCDMA system according to claim 1 and 2 is characterized in that, described network side comprises radio network controller and Node B.
4. the accidental access method of multi-carrier TD-SCDMA system according to claim 3, it is characterized in that, also be included in described network side, dispose physical access channel and Random Access Channel to Node B by radio network controller, and/or ascending pilot channel, Node B is preserved configuration result.
5. the accidental access method of multi-carrier TD-SCDMA system according to claim 4, it is characterized in that, also be included in described network side, receive the ascending pilot channel that described portable terminal sends by described Node B, and launch described physical access channel to portable terminal, portable terminal sends described Random Access Channel then, and Node B receives and handles.
6. the accidental access method of multi-carrier TD-SCDMA system according to claim 5, it is characterized in that, for many physical access channel on the carrier wave, the uplink synchronous code numbering mould physical access channel bar number that Node B and portable terminal are launched on ascending pilot channel according to portable terminal selects wherein one to transmit and receive.
7. the accidental access method of multi-carrier TD-SCDMA system according to claim 1 and 2 is characterized in that, described configuration result sends to described portable terminal with the form of system information by the mode of broadcasting.
8. the accidental access method of multi-carrier TD-SCDMA system according to claim 1 and 2 is characterized in that, described Random Access Channel is that Physical Random Access Channel and up enhancing insert ascending control channel at random.
9. the accidental access method of multi-carrier TD-SCDMA system according to claim 8, it is characterized in that, described Physical Random Access Channel on each described carrier wave and described up enhancing insert ascending control channel at random and share code channel, wherein, determine to be to use described Physical Random Access Channel access also to be to use described up enhancing to insert the ascending control channel access at random by described uplink synchronous code being configured to two types.
10. according to the accidental access method of claim 1 or 2 or 9 described multi-carrier TD-SCDMA systems, it is characterized in that, configuration one or more described physical access channel on described one or more carrier wave, and configuration one or more described Random Access Channel on identical and/or different described carrier waves, wherein, article one, described Random Access Channel is associated with a physical access channel on the carrier wave, and/or be associated with many physical access channel on a plurality of carrier waves, a described physical access channel is associated with one or more described Random Access Channel.
11. the accidental access method of multi-carrier TD-SCDMA system according to claim 10, it is characterized in that, frame when receiving described physical access channel or subframe numbers select with the corresponding described Random Access Channel of described physical access channel in one be used to send described upstream data.
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| CN102271415A (en) * | 2010-06-01 | 2011-12-07 | 中兴通讯股份有限公司 | Method and system for processing conflict between random access procedure and carrier operation procedure |
| CN102083213A (en) * | 2010-08-13 | 2011-06-01 | 大唐移动通信设备有限公司 | Uplink resource allocation indicating method, system and device |
| WO2012146154A1 (en) * | 2011-04-29 | 2012-11-01 | 中兴通讯股份有限公司 | Uplink synchronization method and system in multi-carrier communication system |
| WO2012155626A1 (en) * | 2011-05-18 | 2012-11-22 | 中兴通讯股份有限公司 | Transmission method and system of physical random access channel |
| CN103052070A (en) * | 2011-10-14 | 2013-04-17 | 中国移动通信集团江苏有限公司 | Method for configuring and optimizing carrier frequencies in multiple carrier frequency system and wireless network controller |
| CN103973412A (en) * | 2013-01-30 | 2014-08-06 | 华为技术有限公司 | Method and related equipment for acquiring base station downlink feedback information |
| CN105874850A (en) * | 2014-01-31 | 2016-08-17 | 株式会社Ntt都科摩 | Mobile station and data transmission method |
| CN105874850B (en) * | 2014-01-31 | 2019-11-01 | 株式会社Ntt都科摩 | Mobile station and method for transmitting uplink data |
| WO2016183728A1 (en) * | 2015-05-15 | 2016-11-24 | 华为技术有限公司 | Terminal, base station and scheduling request transmission method |
| US11122606B2 (en) | 2015-05-15 | 2021-09-14 | Huawei Technologies Co., Ltd. | Terminal, base station, and scheduling request transmission method |
| WO2018028336A1 (en) * | 2016-08-12 | 2018-02-15 | 电信科学技术研究院 | Random access method and device |
| CN107734712A (en) * | 2016-08-12 | 2018-02-23 | 电信科学技术研究院 | A kind of accidental access method and equipment |
| CN109392048A (en) * | 2017-08-11 | 2019-02-26 | 华为技术有限公司 | Signal sending method, receiving method and device |
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| CN101400150B (en) | 2011-01-19 |
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