CN107623953B - Base station, user equipment and random access method thereof - Google Patents
Base station, user equipment and random access method thereof Download PDFInfo
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- CN107623953B CN107623953B CN201610554192.XA CN201610554192A CN107623953B CN 107623953 B CN107623953 B CN 107623953B CN 201610554192 A CN201610554192 A CN 201610554192A CN 107623953 B CN107623953 B CN 107623953B
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Abstract
The random access method of the user equipment comprises the following steps: generating a downlink signaling for triggering random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells; and sending the generated downlink signaling to the user equipment so that the user equipment initiates random access on one of the plurality of auxiliary authorized access cells by using corresponding random access resources. By the scheme, the success rate of random access of the user equipment on the auxiliary authorized access cell can be improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a base station, a user equipment, and a random access method thereof.
Background
Carrier Aggregation (CA) is a technique for increasing transmission bandwidth introduced in a Long Term Evolution-Advanced (LTE-Advanced) system in order to meet the requirement of increasing the peak rate of a single user and the system capacity. During carrier aggregation, a ue has a Primary Cell (PCell), acquires layer 3 control signaling such as system messages and paging messages from the Primary Cell, and other cells are Secondary cells (scells), which may be one or more Secondary cells. The primary cell and the secondary cell are both referred to as serving cells. In practice, the Timing Advance (TA) of the user equipment for different cells may be different, so that different serving cells may belong to different Timing Advance Groups (TAGs). Among them, TAG containing the primary cell is called pTAG, and TAG not containing the primary cell PCell is called sstag. The user equipment may obtain which timing advance group the secondary cell belongs to through Radio Resource Control (RRC) signaling sent by the base station.
3GPP LTE release 14(R14) introduces enhanced-Assisted-authorized (access LAA) feature, which can support uplink data transmission on an unlicensed secondary cell (LAA SCell). The LAA SCell and the licensed PCell/SCell(s) may belong to different Timing Advance Groups (TAGs). In this case, in order to perform uplink synchronization of the LAA SCell, random access needs to be performed on the LAA SCell. Before uplink transmission, the UE needs to perform LBT to obtain the use right of the unlicensed frequency.
However, in the prior art, the user equipment may not be able to perform uplink transmission on the LAASCell using PRACH resources allocated by a base station (eNB) because the user equipment may not obtain the frequency usage right in time, and thus there is a problem of low random access success rate.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to improve the success rate of random access on the LAA SCell.
In order to solve the above problem, an embodiment of the present invention provides a random access method for a user equipment, including: generating a downlink signaling for triggering random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells; and sending the generated downlink signaling to user equipment so that the user equipment initiates random access on one of the plurality of auxiliary authorized access cells by using corresponding random access resources.
Optionally, the multiple secondary authorized access cells belong to the same timing advance group.
Optionally, the random access resources corresponding to each of the secondary authorized access cells are in one or more groups.
Optionally, each group of the random access resources includes PRACH time domain and frequency domain information and information of a corresponding random access preamble index.
The embodiment of the invention also provides another random access method of the user equipment, which comprises the following steps: receiving a downlink signaling which is sent by a base station and triggers random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells; and analyzing information of a plurality of randomly accessed auxiliary authorized access cells and random access resources corresponding to the auxiliary authorized access cells from the downlink signaling, and initiating random access on one of the plurality of auxiliary authorized access cells by using the corresponding random access resources.
Optionally, the method further comprises: refraining from transmitting the random access preamble on other of the plurality of secondary authorized access cells when it is determined that the transmitting of the random access preamble on one of the plurality of secondary authorized access cells is successful.
Optionally, the multiple secondary authorized access cells belong to the same timing advance user group.
Optionally, the random access resources corresponding to each secondary authorized access cell are one or more groups.
Optionally, each group of the random access resources includes PRACH time domain and frequency domain information and information of a corresponding random access preamble index.
Optionally, the initiating random access on one of the multiple secondary authorized access cells using the corresponding random access resource includes: arranging the random access resources of the auxiliary authorized access cells according to the sequence of the PRACH time domain from front to back; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
An embodiment of the present invention further provides a base station, including: a signaling generating unit, adapted to generate a downlink signaling triggering random access, where the downlink signaling includes multiple randomly accessed auxiliary authorized access cells and information of random access resources corresponding to the auxiliary authorized access cells; a signaling sending unit, adapted to send the generated downlink signaling to a user equipment, so that the user equipment initiates random access on one of the multiple secondary authorized access cells using a corresponding random access resource.
Optionally, the multiple secondary authorized access cells belong to the same timing advance group.
Optionally, the random access resources corresponding to each secondary authorized access cell are one or more groups.
Optionally, each group of the random access resources includes PRACH time domain and frequency domain information and information of a corresponding random access preamble index.
An embodiment of the present invention further provides a user equipment, including: a receiving unit, adapted to receive a downlink signaling triggering random access sent by a base station, where the downlink signaling includes multiple randomly accessed auxiliary authorized access cells and information of random access resources corresponding to each of the auxiliary authorized access cells; and the random access unit is suitable for analyzing a plurality of auxiliary authorized access cells which are randomly accessed and the information of random access resources corresponding to the auxiliary authorized access cells from the downlink signaling, and initiating random access on one of the plurality of auxiliary authorized access cells by using the corresponding random access resources.
Optionally, the user equipment further includes: an access control unit adapted to prohibit sending the random access preamble on other secondary authorized access cells of the plurality of secondary authorized access cells when it is determined that sending the random access preamble on one of the plurality of secondary authorized access cells is successful.
Optionally, the multiple secondary authorized access cells belong to the same timing advance user group.
Optionally, the random access resources corresponding to each secondary authorized access cell are one or more groups.
Optionally, each group of the random access resources includes PRACH time domain and frequency domain information and information of a corresponding random access preamble index.
Optionally, the random access unit is adapted to arrange the random access resources of the multiple secondary authorized access cells in order from front to back of a PRACH time domain; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
Compared with the prior art, the technical scheme of the invention has the following advantages:
in the above scheme, the base station configures information of multiple auxiliary authorized access cells for the user equipment to perform random access, so that the user equipment can perform random access on the multiple auxiliary authorized access cells configured by the base station instead of only performing random access on the unique auxiliary authorized access cell designated by the base station when receiving the downlink signaling of the base station triggering random access, thereby improving the success rate of random access performed on the auxiliary authorized access cells by the user equipment and improving the use experience of the user.
Further, the base station allocates one or more groups of random access resources different in time domain to the user equipment, so that the user equipment can use any one group of random access resources in the one or more groups of random access resources configured by the base station to perform random access on the auxiliary authorized access cell when receiving a signaling triggering random access of the base station, the success rate of random access of the user equipment on the auxiliary authorized access cell can be further improved, and the use experience of the user is improved.
Drawings
Fig. 1 is a flowchart of a random access method of a user equipment in an embodiment of the present invention;
fig. 2 is a flowchart of a random access method of another user equipment in an embodiment of the present invention;
fig. 3 is a flowchart of a random access method of a user equipment in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a user equipment in an embodiment of the present invention.
Detailed Description
In order to solve the above problems in the prior art, in the technical scheme adopted in the embodiment of the present invention, the base station configures information of multiple auxiliary authorized access cells for performing random access for the user equipment, so that the user equipment can perform random access on the multiple auxiliary authorized access cells configured by the base station when receiving a downlink signaling triggering the random access of the base station, thereby improving a success rate of the random access performed on the auxiliary authorized access cells by the user equipment and improving user experience.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 shows a flowchart of a random access method of a user equipment in an embodiment of the present invention. The random access method of the user equipment shown in fig. 1 may include:
step S101: and generating a downlink signaling for triggering random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells.
In a specific implementation, the downlink signaling is a physical layer control signaling.
Step S102: and sending the generated downlink signaling to the user equipment so that the user equipment initiates random access on one of the plurality of auxiliary authorized access cells by using corresponding random access resources.
In specific implementation, the base station configures a plurality of random access LAA SCells for the UE, and compared with the prior art in which only one random access LAA SCell is configured, the success rate of random access of the UE on the LAA SCell can be improved.
Referring to fig. 2, in a specific implementation, another random access method of a user equipment in an embodiment of the present invention may include the following steps:
step S201: receiving a downlink signaling which is sent by a base station and triggers random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells.
Step S202: and analyzing information of a plurality of randomly accessed auxiliary authorized access cells and random access resources corresponding to the auxiliary authorized access cells from the downlink signaling, and initiating random access on one of the plurality of auxiliary authorized access cells by using the corresponding random access resources.
The random access method of the ue in the embodiment of the present invention will be described in further detail with reference to fig. 3.
Fig. 3 shows a flowchart of a random access method of a user equipment in an embodiment of the present invention. Referring to fig. 3, a random access method of a user equipment in an embodiment of the present invention may include the following steps:
step S301: and receiving a downlink signaling which is sent by a base station and triggers random access, and analyzing information of a plurality of LAA SCells and random access resources corresponding to the auxiliary authorization access cells from the downlink signaling.
In a specific implementation, the base station may carry, in a downlink signaling for triggering random access sent to the UE, information of a plurality of LAA scells for performing random access when using an unlicensed frequency resource for the UE, and a random access resource corresponding to each LAASCell in the plurality of LAA scells.
In a specific implementation, the Random Access resources corresponding to each LAA SCell may be a group, where each group of Random Access resources includes Physical Random Access Channel (PRACH) resources and information of a Random Access preamble index.
In an embodiment of the present invention, in order to further improve the success rate of random access of the UE, the random access resources corresponding to the LAA SCell may be multiple groups, and PRACH resources in each group of random access resources are different in a time domain, that is, located in different subframes, so that the UE may try to send a corresponding random access preamble multiple times on the corresponding LAA SCell according to a timing sequence, so as to improve the success rate of random access of the UE on the LAA SCell.
In a specific implementation, when receiving a downlink signaling triggering random access sent by a base station, a UE may first parse, from the downlink signaling triggering random access, information of a plurality of corresponding LAA scells and a random access resource corresponding to each LAA SCell.
Step S302: and the UE tries to send a corresponding random access preamble on the LAA SCell of the corresponding bit sequence in the plurality of LAA SCells according to the sequence from the front to the back of the PREACH time domains in the random access resources corresponding to the plurality of LAA SCells analyzed from the downlink signaling.
In a specific implementation, when determining the selected LAA SCell, the UE may attempt to transmit a corresponding random access preamble on the LAA SCell. Specifically, the UE firstly arranges the random access resources of the multiple auxiliary authorized access cells in the sequence from the front to the back of the PRACH time domain, and respectively tries to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the bit sequence according to the arrangement sequence of the random access resources, so as to determine whether the corresponding random access preambles can be successfully sent on the auxiliary authorized access cells corresponding to the random access resources of the bit sequence.
Step S303: judging whether a corresponding random access preamble can be successfully sent on the LAA SCell corresponding to the bit sequence; when the judgment result is yes, step S303 may be performed; otherwise, step S305 may be performed.
Step S304: refraining from transmitting corresponding random access preambles on other LAA SCells of the plurality of LAA SCells.
In a specific implementation, because the multiple LAA scells configured in the downlink signaling triggering random access sent to the UE by the base station belong to the same timing advance group, after the corresponding random access preamble index is successfully sent on the selected LAA SCell, a random access response may be received on the corresponding primary cell to obtain timing advance information of the timing advance group. Therefore, when the UE successfully transmits the random access preamble on one LAA SCell of the plurality of LAA scells, the UE is prohibited from transmitting the random access preamble on the other LAA scells of the plurality of LAA scells, that is, the UE is ensured to transmit the random access preamble only once, so as to avoid waste of resources.
Step S305: and the UE tries to send a corresponding random access preamble on the LAA SCell corresponding to the random access resource of the next bit sequence until the corresponding random access preamble is successfully sent on any LAA SCell in the plurality of LAA SCells.
In a specific implementation, when the UE fails to transmit the corresponding random access preamble index on the selected LAA SCell, the UE may continue to try to transmit the corresponding random access preamble on the LAA SCell corresponding to the random access resource of the next bit sequence until any LAA SCell in the plurality of LAA scells successfully transmits the corresponding random access preamble.
As can be seen from the above description, since the base station configures multiple LAA scells for the UE in the downlink signaling triggering random access, the UE can try to send random access preambles on different LAA scells, so that the success rate of random access of the user equipment on the LAA SCell can be improved, and the user experience of the user is improved.
The random access method of the user equipment in the embodiment of the present invention is described in detail above, and apparatuses corresponding to the foregoing method will be described below.
Fig. 4 shows a structure of a base station in an embodiment of the present invention. Referring to fig. 4, in a specific implementation, a base station 400 in the embodiment of the present invention may include a signaling generating unit 401 and a signaling sending unit 402, where:
the signaling generating unit 401 is adapted to generate a downlink signaling for triggering random access, where the downlink signaling includes multiple randomly accessed auxiliary authorized access cells and information of random access resources corresponding to the auxiliary authorized access cells.
In a specific implementation, the multiple secondary authorized access cells belong to the same timing advance group, the random access resources corresponding to each secondary authorized access cell are in one or more groups, and each group of the random access resources includes PRACH time domain and frequency domain information and information of a corresponding random access preamble index.
The signaling sending unit 402 is adapted to send the generated downlink signaling to the user equipment, so that the user equipment initiates random access on one of the multiple secondary authorized access cells using a corresponding random access resource.
Fig. 5 shows a structure of a user equipment in an embodiment of the present invention. Referring to fig. 5, in a specific implementation, a user equipment 500 in an embodiment of the present invention may include a receiving unit 501 and a random access unit 502, where:
the receiving unit 501 is adapted to receive a downlink signaling for triggering random access sent by a base station, where the downlink signaling includes multiple randomly accessed auxiliary authorized access cells and information of random access resources corresponding to each of the auxiliary authorized access cells.
In a specific implementation, the multiple auxiliary authorized access cells belong to the same timing advance user group, and the random access resources corresponding to each auxiliary authorized access cell are one or more groups.
The random access unit 502 is adapted to parse the information of multiple randomly accessed auxiliary authorized access cells and random access resources corresponding to the auxiliary authorized access cells from the downlink signaling, and initiate random access on one of the multiple auxiliary authorized access cells using the corresponding random access resources, where each group of random access resources includes PRACH time domain and frequency domain information and information of corresponding random access preamble indexes.
In a specific implementation, the random access unit 502 is adapted to arrange the random access resources of the multiple secondary authorized access cells in a sequence from a front to a back of a PRACH time domain; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
In an embodiment of the present invention, the user equipment 500 further includes an access control unit 503, where:
the access control unit 503 is adapted to prohibit sending the random access preamble on other secondary authorized access cells of the plurality of secondary authorized access cells when it is determined that sending the random access preamble on one of the plurality of secondary authorized access cells is successful.
By adopting the scheme, the base station configures the information of the plurality of auxiliary authorized access cells for the user equipment to perform random access, so that the user equipment can perform random access on the plurality of auxiliary authorized access cells configured by the base station instead of only performing random access on the unique auxiliary authorized access cell designated by the base station when receiving the downlink signaling triggering the random access of the base station, thereby improving the success rate of the random access of the user equipment on the auxiliary authorized access cells and improving the use experience of users.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructions associated with hardware via a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The method and system of the embodiments of the present invention have been described in detail, but the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (14)
1. A random access method of a User Equipment (UE), comprising:
generating a downlink signaling for triggering random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells; each group of random access resources comprises PRACH time domain and frequency domain information and information of corresponding random access preamble indexes;
sending the generated downlink signaling to the user equipment so that the user equipment initiates random access on one of the plurality of auxiliary authorized access cells by using corresponding random access resources;
the user equipment initiates random access on one of the multiple secondary authorized access cells by using the corresponding random access resource, and the method comprises the following steps: arranging the random access resources of the auxiliary authorized access cells according to the sequence of the PRACH time domain from front to back; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
2. The random access method of the UE of claim 1, wherein the multiple secondary grant access cells belong to a same timing advance group.
3. The random access method of the ue of claim 1, wherein the random access resources corresponding to the secondary authorized access cells are one or more groups.
4. A random access method of a User Equipment (UE), comprising:
receiving a downlink signaling which is sent by a base station and triggers random access, wherein the downlink signaling comprises a plurality of auxiliary authorized access cells which are accessed randomly and information of random access resources corresponding to the auxiliary authorized access cells; each set of the random access resources includes: PRACH time domain and frequency domain information and corresponding random access preamble index information;
analyzing information of a plurality of auxiliary authorized access cells which are randomly accessed and random access resources corresponding to the auxiliary authorized access cells from the downlink signaling, and initiating random access on one of the plurality of auxiliary authorized access cells by using the corresponding random access resources, wherein the method comprises the following steps: arranging the random access resources of the auxiliary authorized access cells according to the sequence of the PRACH time domain from front to back; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
5. The random access method of the user equipment according to claim 4, further comprising:
refraining from transmitting the random access preamble on other of the plurality of secondary authorized access cells when it is determined that the transmitting of the random access preamble on one of the plurality of secondary authorized access cells is successful.
6. The random access method of the UE of claim 4, wherein the multiple secondary grant access cells belong to a same timing advance user group.
7. The UE random access method of claim 4, wherein the one or more sets of random access resources correspond to each of the secondary grant access cells.
8. A base station, comprising:
a signaling generating unit, adapted to generate a downlink signaling triggering random access, where the downlink signaling includes multiple randomly accessed auxiliary authorized access cells and information of random access resources corresponding to the auxiliary authorized access cells; each group of random access resources comprises PRACH time domain and frequency domain information and information of corresponding random access preamble indexes;
a signaling sending unit, adapted to send the generated downlink signaling to a user equipment, so that the user equipment initiates random access on one of the multiple secondary authorized access cells using a corresponding random access resource; the user equipment initiates random access on one of the multiple secondary authorized access cells by using the corresponding random access resource, and the method comprises the following steps: arranging the random access resources of the auxiliary authorized access cells according to the sequence of the PRACH time domain from front to back; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
9. The base station of claim 8, wherein the plurality of secondary licensed access cells belong to a same timing advance group.
10. The base station of claim 8, wherein the random access resources corresponding to each secondary authorized access cell are one or more groups.
11. A user device, comprising:
a receiving unit, adapted to receive a downlink signaling triggering random access sent by a base station, where the downlink signaling includes multiple randomly accessed auxiliary authorized access cells and information of random access resources corresponding to each of the auxiliary authorized access cells; each set of the random access resources includes: PRACH time domain and frequency domain information and corresponding random access preamble index information;
a random access unit, adapted to analyze information of a plurality of auxiliary authorized access cells for random access and random access resources corresponding to each of the auxiliary authorized access cells from the downlink signaling, and initiate random access on one of the plurality of auxiliary authorized access cells using the corresponding random access resource;
the random access unit is suitable for arranging the random access resources of the auxiliary authorized access cells according to the sequence of the PRACH time domain from front to back; and respectively trying to send corresponding random access preambles on the auxiliary authorized access cells corresponding to the random access resources of the corresponding bit sequences according to the sequence until the corresponding random access preambles are successfully sent on one of the plurality of auxiliary authorized access cells.
12. The user equipment of claim 11, further comprising:
an access control unit adapted to prohibit sending the random access preamble on other secondary authorized access cells of the plurality of secondary authorized access cells when it is determined that sending the random access preamble on one of the plurality of secondary authorized access cells is successful.
13. The UE of claim 11, wherein the multiple secondary grant access cells belong to a same timing advance user group.
14. The UE of claim 11, wherein the one or more groups of random access resources correspond to the secondary authorized access cells.
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Han Chuanhua Inventor before: Han Chuanhua Inventor before: Deng Yun |