CN101998646A - Random access method and device for long term evolution (LTE) system - Google Patents
Random access method and device for long term evolution (LTE) system Download PDFInfo
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- CN101998646A CN101998646A CN200910167515XA CN200910167515A CN101998646A CN 101998646 A CN101998646 A CN 101998646A CN 200910167515X A CN200910167515X A CN 200910167515XA CN 200910167515 A CN200910167515 A CN 200910167515A CN 101998646 A CN101998646 A CN 101998646A
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- 238000006116 polymerization reaction Methods 0.000 claims description 128
- 238000004891 communication Methods 0.000 claims description 22
- 230000004044 response Effects 0.000 claims description 21
- 239000000203 mixture Substances 0.000 abstract description 12
- 230000002776 aggregation Effects 0.000 abstract description 11
- 238000004220 aggregation Methods 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000000969 carrier Substances 0.000 abstract description 3
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention provides random access method and device for a long term evolution (LTE) system. The method comprises the following steps of: grouping an aggregation carrier of an uplink according to the bandwidth capabilities of all user terminals required to be supported by a base station to obtain an uplink aggregation carrier group; setting a downlink aggregation carrier group corresponding to the uplink aggregation carrier group by the base station, wherein the uplink aggregation carrier group and the downlink aggregation carrier group form an aggregation carrier pair; and determining the physical random access channel parameter of the aggregation carrier pair by the base station. The invention reduces the occupation to channel resources in a physical random access process and is helpful to suppress virtual alarms and improve the detection properties, thereby improving the utilization rate of carrier resources and the random access efficiency and overcoming the loss of virtual alarms and error detection properties due to allocating more resources to the uplink, and moreover, the problem of expense increase brought by resource requesting on composition carriers of the uplink is solved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of accidental access method and device that is used for long evolving system.
Background technology
In follow-on broadband wireless communication network, how to solve in the cordless communication network and to support bigger bandwidth to become a key factor that improves inter-cell user terminal throughput and user terminal average throughput under the bandwidth in current wireless communication system and be faced with formidable challenges.
At present, in the Long Term Evolution LTE of third generation partner program (Long TermEvolution) technology, propose to adopt the mode of carrier aggregation to come in current wireless communication system, to support effectively bigger bandwidth, to satisfy in the new generation of wireless standard demand to indexs such as throughput, peak rates.Carrier aggregation is to support the key technology of bigger bandwidth in the future broadband wireless communication systems, by different carrier waves is carried out polymerization, form the carrier wave of bigger bandwidth, the user terminal UT (UserTerminal) that support has stronger ability on the bandwidth after the polymerization, for example, the bandwidth that surpasses 100MHz among the LTE-Advanced.
The inventor finds since when professional asymmetric between up link and the down link will cause carrier aggregation in the wireless communication system carrier wave of up link and down link asymmetric, under asymmetric carrier case, requiring all to form carrier wave must backward compatibility could support the user terminal of all bandwidth ability to insert, there is bigger restriction in the scheduling of resource of base station BS (Base Station), in order to distinguish the pairing downlink carrier of uplink carrier, be necessary for uplink carrier and distribute more resources, thereby the loss that causes false-alarm newspaper and flase drop to survey performance, and the increase that resource request is brought expense on up link composition carrier wave.
Summary of the invention
The present invention aims to provide a kind of accidental access method that is used for long evolving system, can solve under asymmetric carrier case, requiring all to form carrier wave must backward compatibility could support the user terminal of all bandwidth ability to insert, there is bigger restriction in the scheduling of resource of base station, in order to distinguish the pairing downlink carrier of uplink carrier, be necessary for uplink carrier and distribute more resources, thereby the loss that causes false-alarm newspaper and flase drop to survey performance, and resource request is brought the problem of the increase of expense on up link composition carrier wave.
To achieve these goals, according to an aspect of the present invention, a kind of accidental access method that is used for long evolving system is provided, may further comprise the steps: the bandwidth ability of all user terminals that the base station is supported as required, polymerization carrier wave to up link divides into groups, and obtains up link polymerization carrier wave set; The base station is provided with and the corresponding down link polymerization of up link polymerization carrier wave set carrier wave set, and it is right that down link polymerization carrier wave set and up link polymerization carrier wave set form the polymerization carrier wave; The physical accidental access channel parameter that the polymerization carrier wave is right is determined in the base station.
Preferably, in above-mentioned accidental access method, the accidental access channel parameter that it is right that the polymerization carrier wave is determined in the base station specifically comprises: the base station receives the request message of access at random from first user terminal; The definite corresponding first down link polymerization carrier wave set of up link polymerization carrier wave set that conforms to the first user terminal bandwidth ability in base station; Accidental access response message is launched in the base station on the first down link polymerization carrier wave set, accidental access response message comprises physical accidental access channel parameter.
Preferably, in above-mentioned accidental access method, physical accidental access channel parameter comprises time, frequency and sign indicating number resource.
Preferably, in above-mentioned accidental access method, each up link polymerization carrier wave set is corresponding to the user terminal with similar bandwidth ability.
Preferably, in above-mentioned accidental access method, the base station is carried out semi-static configuration according to the current environment of cordless communication network and loading condition to the corresponding relation of up link polymerization carrier wave set and down link polymerization carrier wave set.
Preferably, in above-mentioned accidental access method, down link polymerization carrier wave set comprises a down link polymerization carrier wave.
Preferably, in above-mentioned accidental access method, down link polymerization carrier wave set comprises a plurality of down link polymerization carrier waves.
To achieve these goals, according to a further aspect in the invention, a kind of accidental access device that is used for long evolving system is provided, comprise: grouping module, the bandwidth ability of all user terminals that are used for supporting as required the base station, polymerization carrier wave to up link divides into groups, and obtains up link polymerization carrier wave set; Module is set, is used for the base station and is provided with and the corresponding down link polymerization of up link polymerization carrier wave set carrier wave set, it is right that down link polymerization carrier wave set and up link polymerization carrier wave set form the polymerization carrier wave; Parameter module is used for the physical accidental access channel parameter that the base station determines that the polymerization carrier wave is right.
Preferably, in above-mentioned accidental access device, parameter module specifically comprises: receiving element is used for the at random access request message of base station reception from first user terminal; Corresponding unit is used for the definite corresponding first down link polymerization carrier wave set of up link polymerization carrier wave set that conforms to the first user terminal bandwidth ability in base station; Response unit is used for the base station and launches accidental access response message on the first down link polymerization carrier wave set, and accidental access response message comprises physical accidental access channel parameter.
Preferably, above-mentioned accidental access device also comprises: configuration module is used for the base station and according to the current environment of cordless communication network and loading condition the corresponding relation of up link polymerization carrier wave set and down link polymerization carrier wave set is carried out semi-static configuration.
The bandwidth ability of all user terminals that the foregoing description is supported at first as required, polymerization carrier wave to up link divides into groups, the down link polymerization carrier wave set corresponding with up link polymerization carrier wave set is set then, determine the right physical accidental access channel parameter of polymerization carrier wave that up link polymerization carrier wave set and down link polymerization carrier wave set constitute at last, do like this, make the base station when user terminal is inserted at random, only need utilize the particular downlink polymerization carrier wave set of this user terminal correspondence, and need not to take other downlink carrier resource, reduced taking channel resource in the physical accidental access procedure, help to suppress the false-alarm newspaper and improve the detection performance, thereby the efficient that has improved the utilance of carrier resource and inserted at random, so overcome under asymmetric carrier case, requiring all to form carrier wave must backward compatibility could support the user terminal of all bandwidth ability to insert, there is bigger restriction in the scheduling of resource of base station, in order to distinguish the pairing downlink carrier of uplink carrier, be necessary for uplink carrier and distribute more resources, thereby the loss that causes false-alarm newspaper and flase drop to survey performance, and resource request is brought the problem of the increase of expense on up link composition carrier wave.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the flow chart according to the accidental access method of first embodiment of the invention;
Fig. 2 shows the flow chart according to the accidental access method of second embodiment of the invention;
Fig. 3 shows the structure chart according to the accidental access device of third embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Fig. 1 shows the flow chart according to the accidental access method of first embodiment of the invention, and this method may further comprise the steps:
The bandwidth ability of all UT that step S102, BS support is as required divided into groups to the polymerization carrier wave of up link, obtains up link polymerization carrier wave set;
Step S104, BS is provided with and the corresponding down link polymerization of up link polymerization carrier wave set carrier wave set, and it is right that down link polymerization carrier wave set and up link polymerization carrier wave set form the polymerization carrier wave;
Step S106, BS determine the physical accidental access channel parameter that the polymerization carrier wave is right.
The bandwidth ability of all UT that present embodiment is supported at first as required, polymerization carrier wave to up link divides into groups, the down link polymerization carrier wave set corresponding with up link polymerization carrier wave set is set then, determine the right physical accidental access channel parameter of polymerization carrier wave that up link polymerization carrier wave set and down link polymerization carrier wave set constitute at last, wherein, BS need in the cordless communication network will to determine the bandwidth ability of all UT of supporting, just need to understand the bandwidth ability situation of the UT that supports in the current wireless communication system, in order to determine the carrier case of the polymerization of required support in the random access procedure.Do like this, make BS when UT is inserted at random, only need utilize the particular downlink polymerization carrier wave set of this UT correspondence, and need not to take other downlink carrier resource, reduced taking channel resource in the physical accidental access procedure, help to suppress the false-alarm newspaper and improve the detection performance, thereby the efficient that has improved the utilance of carrier resource and inserted at random, so overcome under asymmetric carrier case, requiring all to form carrier wave must backward compatibility could support the UT of all bandwidth ability to insert, there is bigger restriction in the scheduling of resource of BS, in order to distinguish the pairing downlink carrier of uplink carrier, be necessary for uplink carrier and distribute more resources, thereby the loss that causes false-alarm newspaper and flase drop to survey performance, and resource request is brought the problem of the increase of expense on up link composition carrier wave.
Preferably, in above-mentioned accidental access method, step S106 specifically comprises: BS receives the request message of access at random from a UT; The definite corresponding first down link polymerization carrier wave set of up link polymerization carrier wave set that conforms to a UT bandwidth ability of BS; BS launches accidental access response message on the first down link polymerization carrier wave set, accidental access response message comprises physical accidental access channel parameter.
BS in the present embodiment determines the bandwidth ability of UT in the cordless communication network, when UT carries out at random access regulation, BS is provided with one or more down links and forms carrier wave set, the uplink carrier that each down link is formed carrier wave set and one or several UT bandwidth ability is complementary, each DL (Down Link, down link) on the composition carrier wave set a kind of accidental access response message is set, when BS receives the request of access at random of UT, BS only launches accidental access response message on the down link composition carrier wave set of the uplink carrier coupling that conforms to current UT bandwidth ability, under the constant situation of the leading message of BS emission, broadcast different physical accidental access channel parameters to know the bandwidth ability information of more UT.For Physical Random Access Channel, BS only detects the downlink carrier that UT can monitor, and simultaneously, only sends accidental access response message on corresponding downstream link carrier wave, has solved like this in the physical accidental access procedure channel resource is taken excessive problem.
Preferably, in above-mentioned accidental access method, physical accidental access channel parameter comprises time, frequency and sign indicating number resource, thereby knows the bandwidth ability information of more UT.
Preferably, in above-mentioned accidental access method, each up link polymerization carrier wave set is corresponding to the UT with similar bandwidth ability.Do like this, when feasible UT on the same group inserts at random, adopt identical uplink resource, the complete backward compatibility of the new resources that form after these polymerizations.
Preferably, in above-mentioned accidental access method, BS carries out semi-static configuration according to the current environment of cordless communication network and loading condition to the corresponding relation of up link polymerization carrier wave set and down link polymerization carrier wave set.The corresponding relation of up link polymerization carrier wave set and down link polymerization carrier wave set, how corresponding with different downlink carriers the carrier resource that comprises up link is, this corresponding relation can be fixed, also can carry out semi-static configuration by BS, present embodiment is the situation that BS carries out semi-static configuration, be BS according to the variation of wireless communication network environments and loading condition etc., increase or the minimizing down link corresponding with uplink carrier formed carrier wave set, make the Physical Random Access Channel resource can be controlled within the reasonable range fully, thereby reduced the resource overhead that the parameter of the complexity of BS scheduling and the required carrying of Physical Random Access Channel takies effectively.
Preferably, in above-mentioned accidental access method, down link polymerization carrier wave set comprises a down link polymerization carrier wave.The UT that the carrier resource of the composition carrier wave set of the correspondence of present embodiment by asymmetrical up link and down link are set can hold different abilities respectively inserts at random, has guaranteed the backward compatibility performance of cordless communication network.
Preferably, in above-mentioned accidental access method, down link polymerization carrier wave set comprises a plurality of down link polymerization carrier waves.The UT that the carrier resource of the composition carrier wave set of a plurality of correspondences of present embodiment by asymmetrical up link and down link are set can hold different abilities respectively inserts at random, has guaranteed the backward compatibility performance of cordless communication network.
Fig. 2 shows the flow chart according to the accidental access method of second embodiment of the invention, and this method may further comprise the steps:
Step S202, BS need in the cordless communication network to determine the bandwidth ability of all UT of supporting;
Step S204, BS divides into groups according to the bandwidth ability of the UT polymerization carrier wave with up link;
Down link polymerization carrier wave is set for step S206, BS or carrier wave set is corresponding with up link polymerization carrier wave set;
Step S208, BS determine up link, the right physical accidental access channel parameter of down link polymerization carrier wave.
Fig. 3 shows the structure chart according to the accidental access device of third embodiment of the invention, and this device comprises:
Present embodiment at first adopts the bandwidth ability of all UT that grouping module 302 supports as required, polymerization carrier wave to up link divides into groups, adopt then the module 304 settings down link polymerization carrier wave set corresponding with up link polymerization carrier wave set is set, adopt parameter module 306 to determine the right physical accidental access channel parameter of polymerization carrier wave that up link polymerization carrier wave set and down link polymerization carrier wave set constitute at last, do like this, make BS when UT is inserted at random, only need utilize the particular downlink polymerization carrier wave set of this UT correspondence, and need not to take other downlink carrier resource, reduced taking channel resource in the physical accidental access procedure, help to suppress the false-alarm newspaper and improve the detection performance, thereby the efficient that has improved the utilance of carrier resource and inserted at random, so overcome under asymmetric carrier case, requiring all to form carrier wave must backward compatibility could support the UT of all bandwidth ability to insert, there is bigger restriction in the scheduling of resource of BS, in order to distinguish the pairing downlink carrier of uplink carrier, be necessary for uplink carrier and distribute more resources, thereby the loss that causes false-alarm newspaper and flase drop to survey performance, and resource request is brought the problem of the increase of expense on up link composition carrier wave.
Preferably, in above-mentioned accidental access device, parameter module 306 specifically comprises: receiving element is used for the at random access request message of BS reception from a UT; Corresponding unit is used for the definite corresponding first down link polymerization carrier wave set of up link polymerization carrier wave set that conforms to a UT bandwidth ability of BS; Response unit is used for BS and launches accidental access response message on the first down link polymerization carrier wave set, and accidental access response message comprises physical accidental access channel parameter.
BS in the present embodiment determines the bandwidth ability of UT in the cordless communication network, when UT carries out at random access regulation, BS is provided with one or more down links and forms carrier wave set, the uplink carrier that each down link is formed carrier wave set and one or several UT bandwidth ability is complementary, on each DL composition carrier wave set a kind of accidental access response message is set, when BS receives the request of access at random of UT, BS only launches accidental access response message on the down link composition carrier wave set of the uplink carrier coupling that conforms to current UT bandwidth ability, under the constant situation of the leading message of BS emission, broadcast different physical accidental access channel parameters to know the bandwidth ability information of more UT.For Physical Random Access Channel, BS only detects the downlink carrier that UT can monitor, and simultaneously, only sends accidental access response message on corresponding downstream link carrier wave, has solved like this in the physical accidental access procedure channel resource is taken excessive problem.
Preferably, above-mentioned accidental access device also comprises: configuration module is used for BS and according to the current environment of cordless communication network and loading condition the corresponding relation of up link polymerization carrier wave set and down link polymerization carrier wave set is carried out semi-static configuration.The corresponding relation of up link polymerization carrier wave set and down link polymerization carrier wave set, how corresponding with different downlink carriers the carrier resource that comprises up link is, this corresponding relation can be fixed, also can carry out semi-static configuration by BS, present embodiment is the situation that BS carries out semi-static configuration, be BS according to the variation of wireless communication network environments and loading condition etc., increase or the minimizing down link corresponding with uplink carrier formed carrier wave set, make the Physical Random Access Channel resource can be controlled within the reasonable range fully, thereby reduced the resource overhead that the parameter of the complexity of BS scheduling and the required carrying of Physical Random Access Channel takies effectively.
As can be seen from the above description, the above embodiments of the present invention have reduced in the physical accidental access procedure the taking of channel resource, and help to suppress the false-alarm newspaper and improve and detect performance, thus the efficient that has improved the utilance of carrier resource and inserted at random.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
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 (10)
1. an accidental access method that is used for long evolving system is characterized in that, may further comprise the steps:
The bandwidth ability of all user terminals that the base station is supported is as required divided into groups to the polymerization carrier wave of up link, obtains up link polymerization carrier wave set;
Described base station is provided with and the corresponding down link polymerization of described up link polymerization carrier wave set carrier wave set, and it is right that described down link polymerization carrier wave set and described up link polymerization carrier wave set form the polymerization carrier wave;
The right physical accidental access channel parameter of described polymerization carrier wave is determined in described base station.
2. accidental access method according to claim 1 is characterized in that, described base station determines that the right accidental access channel parameter of described polymerization carrier wave specifically comprises:
Described base station receives the request message of access at random from first user terminal;
The definite corresponding first down link polymerization carrier wave set of up link polymerization carrier wave set that conforms to the described first user terminal bandwidth ability in described base station;
Accidental access response message is launched in described base station on the described first down link polymerization carrier wave set, described accidental access response message comprises described physical accidental access channel parameter.
3. accidental access method according to claim 1 is characterized in that, described physical accidental access channel parameter comprises time, frequency and sign indicating number resource.
4. accidental access method according to claim 1 is characterized in that, each described up link polymerization carrier wave set is corresponding to the user terminal with similar bandwidth ability.
5. accidental access method according to claim 1, it is characterized in that described base station is carried out semi-static configuration according to the current environment of cordless communication network and loading condition to the corresponding relation of described up link polymerization carrier wave set and described down link polymerization carrier wave set.
6. accidental access method according to claim 1 is characterized in that, described down link polymerization carrier wave set comprises a down link polymerization carrier wave.
7. accidental access method according to claim 1 is characterized in that, described down link polymerization carrier wave set comprises a plurality of down link polymerization carrier waves.
8. an accidental access device that is used for long evolving system is characterized in that, comprising:
Grouping module, the bandwidth ability of all user terminals that are used for supporting as required the base station is divided into groups to the polymerization carrier wave of up link, obtains up link polymerization carrier wave set;
Module is set, is used for described base station and is provided with and the corresponding down link polymerization of described up link polymerization carrier wave set carrier wave set, it is right that described down link polymerization carrier wave set and described up link polymerization carrier wave set form the polymerization carrier wave;
Parameter module is used for described base station and determines the right physical accidental access channel parameter of described polymerization carrier wave.
9. accidental access device according to claim 8 is characterized in that, described parameter module specifically comprises:
Receiving element is used for the at random access request message of described base station reception from first user terminal;
Corresponding unit is used for the definite corresponding first down link polymerization carrier wave set of up link polymerization carrier wave set that conforms to the described first user terminal bandwidth ability in described base station;
Response unit is used for described base station and launches accidental access response message on the described first down link polymerization carrier wave set, and described accidental access response message comprises described physical accidental access channel parameter.
10. accidental access method according to claim 8 is characterized in that, also comprises:
Configuration module is used for described base station and according to the current environment of cordless communication network and loading condition the corresponding relation of described up link polymerization carrier wave set and described down link polymerization carrier wave set is carried out semi-static configuration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910167515XA CN101998646A (en) | 2009-08-19 | 2009-08-19 | Random access method and device for long term evolution (LTE) system |
| PCT/CN2009/075583 WO2011020269A1 (en) | 2009-08-19 | 2009-12-15 | Random access method and apparatus for a long term evolution system |
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| CN200910167515XA CN101998646A (en) | 2009-08-19 | 2009-08-19 | Random access method and device for long term evolution (LTE) system |
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| CN101998646A true CN101998646A (en) | 2011-03-30 |
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| WO2014023026A1 (en) * | 2012-08-10 | 2014-02-13 | 华为技术有限公司 | Method, bs and ue for random access |
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| WO2017113085A1 (en) * | 2015-12-29 | 2017-07-06 | 华为技术有限公司 | Method and apparatus for random access |
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| US8169992B2 (en) * | 2007-08-08 | 2012-05-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Uplink scrambling during random access |
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| CN101466153A (en) * | 2009-01-07 | 2009-06-24 | 中兴通讯股份有限公司 | Method for completing random access response transmission in radio communication system and base station |
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