CN102388668B - Method and apparatus for transmitting short random access signalings, method and apparatus for carrying short random access channels - Google Patents
Method and apparatus for transmitting short random access signalings, method and apparatus for carrying short random access channels Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001174 ascending effect Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000013507 mapping Methods 0.000 claims description 8
- 230000007774 longterm Effects 0.000 abstract description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- 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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Abstract
A method and an apparatus for transmitting short random access signalings, a method and an apparatus for carrying short random access channels relating to communication technical field, are invented to solve the problem of current Long Term Evolution LTE system that short random access channels can not be carried in Frequency Division Duplex FDD mode. The method for carrying short random access channels provided by the embodiment of the invention includes: determining the slots in down carriers for carrying short random access channels (101); determining the random access signalings according to the position of the slots (102); transmitting the broadcast signalings which carry the random access signalings (103). The embodiment of the present invention enables short random access channels to be carried and saves system overhead.
Description
Technical field
The present invention relates to communication technical field, particularly relate to and a kind ofly send the method and apparatus of short random access signaling and carry the method and apparatus of short Random Access Channel.
Background technology
In LTE system, define five kinds of pilot frequency formats altogether, for user's choice for use during access network in different scene, each pilot frequency format all with a kind of RACH(Random Access Channel, Random Access Channel) corresponding, its parameter is as shown in table 1,
Table 1
Wherein, the time span shared by RACH of pilot frequency format 4 correspondence is only 0.147ms, takies expense and is far smaller than other four kinds of pilot frequency formats, and therefore the RACH of described pilot frequency format 4 correspondence is otherwise known as short RACH.
The main application scenarios of short RACH is the city that radius of society is no more than 1.4km, and in practice, the radius of society in city is all very little, is generally no more than 1.4km; That is, short RACH should be widely used in the LTE system in city.But, due to existing LTE(Long Term Evolution, Long Term Evolution) system is at FDD(Frequency Division Duplex, Frequency Division Duplexing (FDD)) short RACH can not be carried under pattern, even if be therefore no more than in the city of 1.4km at radius of society, also can only adopt the RACH corresponding to other pilot frequency formats, thus cause expense larger.
Summary of the invention
The embodiment provides and a kind ofly send the method and apparatus of short random access signaling and carry the method and apparatus of short Random Access Channel, enable LTE system carry short Random Access Channel in the fdd mode, thus save overhead.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Send a method for short random access signaling, comprising:
Determine the time slot carrying short Random Access Channel in descending carrier;
Short random access signaling is determined according to described time slot;
Send the broadcast signaling carrying described short random access signaling;
Wherein determine that short random access signaling is specially according to described time slot:
The positional information of described short Random Access Channel is determined according to described time slot;
Short random access signaling is obtained according to described positional information.
Carry a method for short Random Access Channel, comprising:
Receive the broadcast signaling carrying short random access signaling;
According to described short random access signaling, obtain the time slot of the short Random Access Channel of carrying;
Described time slot sends short accidental access channel pilot frequency sequence;
Wherein, according to described short random access signaling, the step obtaining the time slot of the short Random Access Channel of carrying is specially:
The positional information of short Random Access Channel is obtained according to described short random access signaling;
The time slot of short Random Access Channel is determined according to described positional information.
Send a device for short random access signaling, comprising:
Time slot determination module, for determining the time slot carrying short Random Access Channel in descending carrier;
Signaling determination module, for determining short random access signaling according to described time slot;
Broadcast transmission module, for sending the broadcast signaling carrying described short random access signaling;
Wherein, described signaling determination module, comprising:
Positional information determining unit, for determining the positional information of described short Random Access Channel according to described time slot;
Signaling acquiring unit, for obtaining short random access signaling according to described positional information.
Carry a device for short Random Access Channel, comprising:
Receiver module, for receiving the broadcast signaling carrying short random access signaling;
Slot selection module, for according to described short random access signaling, obtains the time slot of the short Random Access Channel of carrying;
Pilot tone sending module, for sending short accidental access channel pilot frequency sequence on described time slot;
Wherein, described Slot selection module comprises:
Positional information determining unit, for obtaining the positional information of short Random Access Channel;
Slot determining unit, the positional information for determining according to described positional information determining unit determines the time slot of the short Random Access Channel of described carrying.
The embodiment of the present invention by defining ascending time slot in the radio frames of descending carrier, carries with the carrying out of described ascending time slot to short Random Access Channel, thus achieves carry short Random Access Channel under fdd mode in LTE system, saves overhead.
Accompanying drawing explanation
A kind of flow chart sending the method for short random access signaling that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the time slot of short Random Access Channel is carried in the determination descending carrier that Fig. 2 provides for the embodiment of the present invention;
The frame structure schematic diagram of the radio frames of short Random Access Channel is carried in a kind of descending carrier that Fig. 3 provides for the embodiment of the present invention;
A kind of flow chart carrying the method for short Random Access Channel that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 for the embodiment of the present invention provide according to described random access signaling, select the flow chart of time slot of the short Random Access Channel of carrying;
A kind of structure chart sending the device of short random access signaling that Fig. 6 provides for the embodiment of the present invention;
The structure chart of the time slot determination module that Fig. 7 provides for the embodiment of the present invention;
The structure chart of the signaling determination module that Fig. 8 provides for the embodiment of the present invention;
A kind of structure chart carrying the device of short Random Access Channel that Fig. 9 provides for the embodiment of the present invention;
The structure chart of the Slot selection module that Figure 10 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of method and apparatus carrying short Random Access Channel that the embodiment of the present invention provides is described in detail.
As shown in Figure 1, a kind of method sending short random access signaling that the embodiment of the present invention provides, comprising:
101, the time slot carrying short Random Access Channel in descending carrier is determined;
102, short random access signaling is determined according to described time slot;
103, the broadcast signaling carrying described short random access signaling is sent.
After base station determines in descending carrier the time slot carrying short Random Access Channel, determine the positional information of described short Random Access Channel according to described time slot, described positional information comprises: short Random Access Channel configuration index and/or pilot frequency format and/or short Random Access Channel density.
The positional information be equipped with in base station and user terminal according to described place information inquiry and short random access signaling mapping table, thus the short random access signaling obtained corresponding to described positional information, described short random access signaling is carried in broadcast signaling.Described mapping table is as shown in table 2:
Table 2
Described short random access signaling is totally 4 bits, can provide the state that 16 kinds are different altogether, only uses its front 11 kinds of states in embodiments of the present invention, and namely 0 to 10; Wherein, represent when broadcast signaling is 10, base station does not carry short Random Access Channel.The position of described carrying short Random Access Channel time slot can be characterized with short Random Access Channel density mutually by short Random Access Channel configuration index, namely after base station determines described time slot, described short Random Access Channel configuration index and short Random Access Channel density are also determined thereupon, short random access signaling corresponding to described short Random Access Channel configuration index and short Random Access Channel density is carried in described broadcast signaling, such as, when described short Random Access Channel configuration index is 55, when described short Random Access Channel density is 4, now the two corresponding short random access signaling is 7, be carried in described broadcast signaling by 7 with the form of 4bit binary code, and described broadcast signaling timing is broadcasted in the community of described base station coverage, obtain in time to enable the user terminal that will access in described community,
The positional information of ascending time slot is characterized in embodiments of the present invention with the random access signaling of 4bit, in order to further save signal resource, invention further provides another embodiment, characterizing the position of ascending time slot with the random access signaling of 3bit, as shown in table 3
Table 3
Compared with table 2, the position configuration mode that Random Access Channel density repeats by table 3 is deleted, only reserved 8 kinds of different states, only need just can Complete Characterization with the random access signaling of 3bit, wherein represent when random access signaling is 7 that now base station does not carry short Random Access Channel, therefore, signal resource is saved.
Need special proposition, in order to the backwards compatibility of keeping system, the user namely ensureing other RACH beyond the short RACH of carrying also can normal connecting system, and this just needs to be retained original RACH bearing mode; Namely at the diverse location of described broadcast signaling, contain the short random access signaling in table 2 or table 3 respectively and represent the random access signaling of other RACH bearing modes, user side can be selected voluntarily.
In system, user can according to described short random access signaling, inquire about the positional information and short random access signaling mapping table that arrange at user side, obtain the positional information corresponding to described short random access signaling, and then according to described positional information obtain base station determine the particular location of time slot, and send short accidental access channel pilot frequency sequence to base station at described time slot.
As shown in Figure 2, describedly determine that the step of the time slot carrying short Random Access Channel in descending carrier comprises:
201, the radio frames that descending carrier carries is divided into the equal subframe of at least one time span, wherein at least one subframe is used for short Stochastic accessing;
The subframe that wherein at least one time span is equal can be the subframe that 10 time spans are equal;
202, be at least two time slots by the described sub-frame division being used for short Stochastic accessing, one of them time slot is ascending time slot, described ascending time slot for carrying short Random Access Channel, wherein at least two time slots can be two or three or more.
The embodiment of the present invention is divided into by the radio frames carried by descending carrier the subframe that at least one time span is equal, and the ascending time slot sub-frame division being wherein used for Stochastic accessing gone out for carrying short Random Access Channel, thus achieve carry short Random Access Channel under fdd mode in LTE system, save overhead.
As shown in Figure 3, embodiments provide the frame structure of the radio frames that can carry short Random Access Channel in a kind of descending carrier, in described radio frames, length is that the subframe that the radio frames of 10ms is 1ms by 10 length forms, in described subframe, subframe 1 and subframe 6 are Stochastic accessing subframe, and all the other are common descending sub frame.Described Stochastic accessing subframe is divided into three time slots, comprising: descending time slot, slot time and ascending time slot; Described ascending time slot is for carrying short Random Access Channel.
The frame structure of the radio frames as shown in Figure 3 provided in the embodiment of the present invention illustrated is provided, a kind of structure of radio frames just for carrying short Random Access Channel, in other embodiments of the invention, the frame structure that those skilled in the art provide according to Fig. 3 of the present invention, under the prerequisite not paying creative work, also can obtain other frame structure.
The method of the short Random Access Channel of the carrying that the embodiment of the present invention provides, by defining a kind of radio frames that can carry short Random Access Channel in descending carrier, and the positional information of time slot in described radio frames of the described short Random Access Channel of carrying is broadcasted in system, make user in system can send short accidental access channel pilot frequency sequence according to broadcasted content in the time slot that described positional information is corresponding, thus save overhead.
As shown in Figure 4, embodiments provide a kind of method carrying short Random Access Channel, comprising:
401, the broadcast signaling carrying short random access signaling is received;
When user terminal needs connecting system, first receive the described broadcast signaling of base station broadcast;
402, according to described short random access signaling, the time slot of the short Random Access Channel of carrying is obtained;
Because the embodiment of the present invention has backwards compatibility, namely user both can select to carry short Random Access Channel, also can select to carry other Random Access Channel, user can need to select according to self, when selecting the short Random Access Channel of carrying, then according to described random access signaling, select the time slot of the short Random Access Channel of carrying;
403, on described time slot, short accidental access channel pilot frequency sequence is sent.
As shown in Figure 5, according to described short random access signaling, the step obtaining the time slot of the short Random Access Channel of carrying comprises:
501, the positional information of short Random Access Channel is obtained according to described short random access signaling;
Obtain described short random access signaling from broadcast signaling after, inquiry positional information preset in the user terminal and short random access signaling mapping table, as shown in table 2 or table 3, from table, obtain the positional information of the time slot of the short Random Access Channel of described carrying corresponding to described short random access signaling, described positional information comprises: short Random Access Channel configuration index and/or pilot frequency format and/or short Random Access Channel density.
502, the time slot of short Random Access Channel is determined according to described positional information.
The time slot of the short Random Access Channel of described carrying characterized by described positional information, after user terminal obtains described positional information, according to described positional information, and the time slot of the short Random Access Channel of carrying selecting described positional information corresponding.
The method of the short Random Access Channel of the carrying that the embodiment of the present invention provides, by obtaining short random access signaling from broadcast signaling, the positional information of the time slot of the short Random Access Channel of described carrying is obtained according to described short random access signaling, the time slot of the short Random Access Channel of described carrying is selected according to described positional information, described time slot sends pilot frequency sequence, achieve the carrying of short Random Access Channel, save overhead.
As shown in Figure 6, a kind of device sending short random access signaling that the embodiment of the present invention provides, comprising:
Time slot determination module 601, for determining the time slot carrying short Random Access Channel in descending carrier;
Signaling determination module 602, determines short random access signaling for the time slot determined according to described time slot determination module 601;
Broadcast transmission module 603, for sending the broadcast signaling carrying the short random access signaling that described signaling determination module 602 is determined.
As shown in Figure 7, described time slot determination module 601 comprises:
Sub-frame division unit 701, the radio frames for being carried by descending carrier is divided into the equal subframe of at least one time span, and wherein at least one subframe is used for short Stochastic accessing;
Time-slot division unit 702, be at least two time slots for the sub-frame division being used for short Stochastic accessing divided by described sub-frame division unit 701, one of them time slot is ascending time slot, and described ascending time slot is for carrying short Random Access Channel.
As shown in Figure 8, described signaling determination module 602 comprises:
Positional information determining unit 801, for determining the positional information of described short Random Access Channel according to described time slot;
Signaling acquiring unit 802, obtains short random access signaling for the positional information determined according to described positional information determining unit 801.
The device of the short random access signaling of the transmission that the embodiment of the present invention provides, by defining a kind of radio frames that can carry short Random Access Channel in descending carrier, and the positional information of time slot in described radio frames of the described short Random Access Channel of carrying is broadcasted in system, make user in system can send short accidental access channel pilot frequency sequence according to broadcasted content in the time slot that described positional information is corresponding, thus save overhead.
As shown in Figure 9, embodiments provide a kind of device carrying short Random Access Channel, comprising:
Receiver module 901, for receiving the broadcast signaling carrying short random access signaling;
Slot selection module 902, for according to the short random access signaling the broadcast signaling received from described receiver module 901, selects the time slot of the short Random Access Channel of carrying;
Pilot tone sending module 903, sends short accidental access channel pilot frequency sequence for the time slot selected in described Slot selection module 903.
As shown in Figure 10, described Slot selection module 902 comprises:
Position determination unit 1001, for obtaining the positional information of short Random Access Channel;
Slot determining unit 1002, the positional information for determining according to described positional information determining unit 1001 determines the time slot of the short Random Access Channel of described carrying.
The device of the short Random Access Channel of the carrying that the embodiment of the present invention provides, by receiving the broadcast signaling that base station sends, the positional information of the time slot of the short Random Access Channel of carrying is obtained from described broadcast signaling, and the particular location of described time slot is found according to described positional information, thus achieve the carrying of short Random Access Channel, save overhead.
Embodiments provide a kind of base station and user terminal, comprise the device of the short random access signaling of transmission as shown in Figure 6 in described base station, described user terminal comprises the device of the short Random Access Channel of carrying as shown in Figure 9.
The time slot carrying short Random Access Channel in descending carrier is determined in described base station, determines short random access signaling according to the position of described time slot, and in the community covered, regularly broadcast the broadcast signaling carrying described short random access signaling;
When intra-cell users needs connecting system, first receive described broadcast signaling, therefrom obtain described short random access signaling, the positional information of the time slot carrying short Random Access Channel is determined according to described short random access signaling, and determine described time slot according to described positional information, described time slot sends short accidental access channel pilot frequency sequence to base station.
The base station that the embodiment of the present invention provides and user terminal, achieve user terminal when connecting system, sends short accidental access channel pilot frequency sequence, compared with prior art, save overhead in descending carrier.
One of ordinary skill in the art will appreciate that: realize the hardware that all or part of step in above-described embodiment method can carry out instruction relevant by program and complete, described program can be stored in computer-readable recording medium, as ROM/RAM, magnetic disc or CD etc.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (12)
1. send a method for short random access signaling, it is characterized in that, comprising:
Determine the time slot carrying short Random Access Channel in descending carrier;
Short random access signaling is determined according to described time slot;
Send the broadcast signaling carrying described short random access signaling;
Wherein determine that short random access signaling is specially according to described time slot:
The positional information of described short Random Access Channel is determined according to described time slot;
Short random access signaling is obtained according to described positional information;
Wherein determine that the step of the time slot carrying short Random Access Channel in descending carrier comprises:
The radio frames that descending carrier carries is divided into the equal subframe of at least one time span, and wherein at least one subframe is used for short Stochastic accessing;
By the described sub-frame division of short Stochastic accessing that is used for at least two time slots, one of them time slot is ascending time slot, and described ascending time slot is for carrying short Random Access Channel.
2. the method for the short random access signaling of transmission according to claim 1, wherein obtains short random access signaling according to described positional information and is specially:
According to described place information inquiry positional information and short random access signaling mapping table, thus obtain the short random access signaling corresponding to described positional information.
3. the method for the short random access signaling of transmission according to claim 2, it is characterized in that, in described positional information and short random access signaling mapping table, short random access signaling 4 bits or 3 bit-binary numerical value represent, and described short random access signaling is different, one of them short random access signaling is for representing that base station does not carry short Random Access Channel.
4. the method for the short random access signaling of transmission according to claim 2, described positional information specifically comprises: short Random Access Channel configuration index and/or pilot frequency format and/or short Random Access Channel density.
5. carry a method for short Random Access Channel, it is characterized in that, comprising:
Receive the broadcast signaling carrying short random access signaling;
According to described short random access signaling, obtain the time slot of the short Random Access Channel of carrying;
Described time slot sends short accidental access channel pilot frequency sequence;
Wherein, according to described short random access signaling, the step obtaining the time slot of the short Random Access Channel of carrying is specially:
The positional information of short Random Access Channel is obtained according to described short random access signaling;
The time slot of short Random Access Channel is determined according to described positional information.
6. the method for the short Random Access Channel of carrying according to claim 5, is wherein specially according to the positional information that described short random access signaling obtains short Random Access Channel:
According to described short random access signaling inquiring position information and short random access signaling mapping table,
Obtain the positional information of short Random Access Channel corresponding to described short random access signaling.
7. the method for the short Random Access Channel of carrying according to claim 6, is characterized in that, described positional information comprises:
Short Random Access Channel configuration index and/or pilot frequency format and/or short Random Access Channel density.
8. the method for the short Random Access Channel of carrying according to claim 6, it is characterized in that, in described positional information and short random access signaling mapping table, short random access signaling 4 bits or 3 bit-binary numerical value represent, and described short random access signaling is different, one of them short random access signaling is for representing that base station does not carry short Random Access Channel.
9. send a device for short random access signaling, it is characterized in that, comprising:
Time slot determination module, for determining the time slot carrying short Random Access Channel in descending carrier;
Signaling determination module, for determining short random access signaling according to described time slot;
Broadcast transmission module, for sending the broadcast signaling carrying described short random access signaling;
Wherein, described signaling determination module, comprising:
Positional information determining unit, for determining the positional information of described short Random Access Channel according to described time slot;
Signaling acquiring unit, for obtaining short random access signaling according to described positional information;
Wherein, described time slot determination module comprises:
Sub-frame division unit, the radio frames for being carried by descending carrier is divided into the equal subframe of at least one time span, and wherein at least one subframe is used for short Stochastic accessing;
Time-slot division unit, for being at least two time slots by the described sub-frame division being used for short Stochastic accessing, one of them time slot is ascending time slot, and described ascending time slot is for carrying short Random Access Channel.
10. carry a device for short Random Access Channel, it is characterized in that, comprising:
Receiver module, for receiving the broadcast signaling carrying short random access signaling;
Slot selection module, for according to described short random access signaling, obtains the time slot of the short Random Access Channel of carrying;
Pilot tone sending module, for sending short accidental access channel pilot frequency sequence on described time slot;
Wherein, described Slot selection module comprises:
Positional information determining unit, for obtaining the positional information of short Random Access Channel;
Slot determining unit, the positional information for determining according to described positional information determining unit determines the time slot of the short Random Access Channel of described carrying.
11. 1 kinds of base stations, is characterized in that, described base station comprises the device of the short random access signaling of transmission according to claim 9.
12. 1 kinds of user terminals, is characterized in that, described user terminal comprises the device of the short Random Access Channel of carrying according to claim 10.
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| PCT/CN2009/070794 WO2010102457A1 (en) | 2009-03-13 | 2009-03-13 | Method and apparatus for transmitting short random access signalings, method and apparatus for carrying short random access channels |
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| CN105517182A (en) * | 2014-09-26 | 2016-04-20 | 中兴通讯股份有限公司 | Random access signaling transmitting method and transmitting device |
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| GB2281470A (en) * | 1993-04-02 | 1995-03-01 | Motorola Ltd | Multichannel random access communications systems |
| CN101345580A (en) * | 2008-08-22 | 2009-01-14 | 中兴通讯股份有限公司 | Transmission method and device of random access channel |
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| WO1999044323A2 (en) * | 1998-02-27 | 1999-09-02 | Siemens Aktiengesellschaft | Telecommunications system with wireless code and time-division multiplex based telecommuncation |
| CN1855767B (en) * | 2005-04-18 | 2010-10-06 | 大唐移动通信设备有限公司 | Method for establishing cells with large radius in CDMA communication system synchronized by time division synchronizing codes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281470A (en) * | 1993-04-02 | 1995-03-01 | Motorola Ltd | Multichannel random access communications systems |
| CN101345580A (en) * | 2008-08-22 | 2009-01-14 | 中兴通讯股份有限公司 | Transmission method and device of random access channel |
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| Title |
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| 3RD GENERATION PARTNERSHIP PROJECT.3RD GENERATION PARTNERSHIP PROJECT * |
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