WO2018058574A1 - Random access apparatus, method and communications system - Google Patents

Random access apparatus, method and communications system Download PDF

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Publication number
WO2018058574A1
WO2018058574A1 PCT/CN2016/101205 CN2016101205W WO2018058574A1 WO 2018058574 A1 WO2018058574 A1 WO 2018058574A1 CN 2016101205 W CN2016101205 W CN 2016101205W WO 2018058574 A1 WO2018058574 A1 WO 2018058574A1
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Prior art keywords
random access
beam
access device
access request
identifier
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PCT/CN2016/101205
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French (fr)
Chinese (zh)
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蒋琴艳
周华
郤伟
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富士通株式会社
蒋琴艳
周华
郤伟
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Priority to PCT/CN2016/101205 priority Critical patent/WO2018058574A1/en
Publication of WO2018058574A1 publication Critical patent/WO2018058574A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas

Abstract

A random access apparatus, method and a communications system. The random access method comprises: receiving a random access request sent by a transmitter, the random access request carrying, explicitly or implicitly, a beam identifier selected by the transmitter; determining the beam identifier according to the random access request; calculating a scrambling identifier based on the beam identifier; using the scrambling identifier to execute scrambling of control information so as to indicate a random access response to the transmitter; and sending the scrambled control information and the random access response. In the present invention beam information and scrambling identifiers are taken into consideration in random access configuration, extending application to multi-beam coverage scenarios.

Description

Random access device, method and communication system Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a random access device, a method, and a communication system.

Background technique

In the Third Generation Partnership Project (3GPP, 3 rd Generation Partnership Project ) Long Term Evolution (LTE, Long Term Evolution) system, a user equipment (UE, User Equipment) initial access to the network must pass through a cell search, obtain system information ( SI, System Information) and random access procedures. After obtaining the downlink synchronization by using the cell search, the UE performs random access based on information such as the random access configuration included in the system information, thereby establishing a connection with the cell and obtaining uplink synchronization.

There are two types of random access procedures: contention-based random access procedures and non-competitive random access procedures. In a non-contention random access procedure, the UE performs random access using a random access preamble and a physical random access channel (PRACH) specified by a base station (for example, an eNB). In the contention-based random access procedure, the UE may select preamble and PRACH for random access.

FIG. 1 is a schematic diagram of a random access procedure, illustrating a contention based random access procedure as an example. As shown in FIG. 1, the random access may include the following steps:

(1) The UE transmits a preamble arbitrarily selected among the optional preambles to the base station by using the selected PRACH. After the UE sends the preamble, three subframes are delayed as the start of a Random Access Response (RAR) window. The UE listens to the RAR in the RAR window. The RAR window length can be semi-statically configured by the base station; the initially accessed UE can obtain the RAR window length in the broadcast system information before the random access is initiated.

(2) After receiving the preamble, the base station may respond within the RAR window, that is, send the RAR to the UE; or may not respond, that is, not send the RAR to the UE in the RAR window.

When the RAR is sent by the base station, the location of the RAR in the subframe may be indicated by a Physical Downlink Control Channel (PDCCH). The UE obtains the RAR location sent to itself by decoding the PDCCH. The PDCCH for indicating the RAR location is scrambled by a random access-Radio Network Temporary Identify (RA-RNTI), therefore, the UE must first determine The RA-RNTI can decode the PDCCH.

The RA-RNTI is calculated by the following formula:

RA-RNTI=1+t_id+10*f_id

Where t_id is the sequence number of the first subframe in which the specified PRACH is located. Since each frame contains 10 subframes, 0≤t_id<10; f_id is the sequence number of the specified PRACH in the subframe, and is according to Sorting in the frequency domain ascending order, you can define 0 ≤ f_id < 6.

After the UE detects the scrambled PDCCH transmitted by the base station by using the RA-RNTI, the location of the RAR may be known and the RAR is further decoded, and it is determined whether the preamble sent by the UE is included in the RAR. The UE may continue to decode in the RAR window. If the RAR containing the preamble sent by itself is found, the process proceeds to the next step; if the preamble sent by itself is not found until the end of the RAR window, the preamble of the transmission fails.

(3) The UE sends the message Msg3 in the uplink resource allocated in the RAR. Msg3 contains information identifying the identity of the UE to distinguish between different UEs transmitting the same preamble in the same PRACH.

(4) After confirming the identity of the UE, the base station transmits a message Msg4 to the UE. Msg4 contains the identity confirmation for the successfully accessed UE. The UE receives the Msg4 that confirms its identity, that is, the random access is considered successful.

The random access procedure described above occurs in a single-beam coverage scenario, that is, the base station covers all UEs in the cell through a single omnidirectional beam.

It should be noted that the above description of the technical background is only for the purpose of facilitating a clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these aspects are set forth in the background section of the present invention.

Summary of the invention

However, the inventor found that in the fifth generation (5G) wireless communication system research, a single beam of a base station may only cover UEs in a certain direction within a cell, and the base station needs multiple beams to cover all the cells in the cell. UE. At the same time, the UE may also use Beamforming for uplink transmission.

Therefore, the random access procedure may occur in parallel on multiple downlink or uplink beams. At this time, in the prior art as shown in FIG. 1, since the random access configuration, the RA-RNTI, and the like do not consider the beam information, it cannot be directly applied to the above multi-beam coverage scenario.

Embodiments of the present invention provide a random access apparatus, method, and communication system in a multi-beam coverage scenario. Implement a random access process for user equipment.

According to a first aspect of the present invention, a random access method is provided, which is applied to a receiving end, and the random access method includes:

Receiving a random access request sent by the sending end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end;

Determining the beam identifier according to the random access request;

Calculating a scrambling identifier based on the beam identifier;

Using the scrambling identifier to scramble control information for indicating a random access response of the transmitting end;

Sending the scrambled control information and the random access response.

According to a second aspect of the embodiments of the present invention, a random access device is provided, where the random access device includes:

a request receiving unit, which receives a random access request sent by the sending end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end;

a beam identification determining unit that determines the beam identifier according to the random access request;

a scrambling identifier calculation unit that calculates a scrambling identifier based on the beam identifier;

a scrambling unit that scrambles control information for indicating a random access response of the transmitting end using the scrambling identifier;

An information sending unit that transmits the scrambled control information and the random access response.

According to a third aspect of the embodiments of the present invention, a random access method is provided, which is applied to a sending end, where the random access method includes:

Sending a random access request to the receiving end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end;

Calculating a scrambling identifier based on the beam identifier;

The control information sent by the receiving end is descrambled based on the scrambling identifier, and the random access response sent by the receiving end is received according to the descrambling result.

According to a fourth aspect of the present invention, a random access device is provided, where the random access device includes:

a request sending unit, which sends a random access request to the receiving end, wherein the random access request is explicit or Implicitly carrying a beam identifier selected by the transmitting end;

a scrambling identifier calculation unit that calculates a scrambling identifier based on the beam identifier;

And an information receiving unit that performs descrambling on the control information sent by the receiving end according to the scrambling identifier, and receives a random access response sent by the receiving end according to the descrambling result.

According to a fifth aspect of the embodiments of the present invention, a communication system is provided, the communication system comprising:

a transmitting end configured with the random access device as described in the fourth aspect;

The receiving end is configured with the random access device as described in the second aspect above.

The beneficial effects of the embodiment of the present invention are: a beam identification is explicitly or implicitly carried in the random access request; the beam identifier is determined according to the random access request; and the scrambling identifier is calculated based on the beam identifier; The scrambling identifier scrambles control information for indicating a random access response; and transmits the scrambled control information and the random access response. Thus, the random access configuration and the scrambling indicator and the like can be applied to the multi-beam coverage scenario in consideration of the beam information.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the drawings, in which <RTIgt; It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in one or more other embodiments in the same or similar manner, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprises" or "comprising" or "comprising" or "comprising" or "comprising" or "comprises"

DRAWINGS

The elements and features described in one of the figures or one embodiment of the embodiments of the invention may be combined with the elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the

1 is a schematic diagram of a random access procedure;

2 is a schematic diagram of a random access method according to Embodiment 1 of the present invention;

3 is another schematic diagram of a random access method according to Embodiment 1 of the present invention;

4 is a schematic diagram of a base station transmitting beam-based information according to Embodiment 1 of the present invention;

FIG. 5 is a diagram showing an example of a random access procedure according to Embodiment 1 of the present invention; FIG.

6 is a schematic diagram of a random access method according to Embodiment 2 of the present invention;

7 is a schematic diagram of selecting a longer RAR window for a certain type of UE;

8 is a schematic diagram of selecting a shorter RAR window for a certain type of UE;

9 is a schematic diagram of a certain type of UE transmitting a preamble using different beams;

10 is a schematic diagram of a certain type of UE continuously transmitting preambles in multiple beams;

11 is a schematic diagram of a random access device according to Embodiment 3 of the present invention;

FIG. 12 is another schematic diagram of a random access device according to Embodiment 3 of the present invention; FIG.

13 is a schematic diagram of a random access device according to Embodiment 4 of the present invention;

14 is another schematic diagram of a random access device according to Embodiment 4 of the present invention;

Figure 15 is a schematic diagram of a communication system according to Embodiment 5 of the present invention;

16 is a schematic diagram of a base station according to Embodiment 5 of the present invention;

Figure 17 is a schematic diagram of a user equipment according to Embodiment 5 of the present invention.

detailed description

The foregoing and other features of the present invention will be apparent from the The specific embodiments of the present invention are disclosed in the specification and the drawings, which are illustrated in the embodiment of the invention The invention includes all modifications, variations and equivalents falling within the scope of the appended claims.

In this application, a base station may be referred to as an access point, a broadcast transmitter, a transmission and reception point (TRP), a Node B, an evolved Node B (eNB), and a Radio Remote Head Unit (RRH/RRU). Etc., and may include some or all of their functions. The term "base station" will be used herein. Each base station provides communication coverage for a particular geographic area. The term "cell" can refer to a base station and/or its coverage area, depending on the context in which the term is used.

In this application, a mobile station or device may be referred to as a "User Equipment" (UE). A UE may be fixed or mobile and may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, and the like. The user equipment can be a cellular telephone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a machine type communication device, a laptop computer, a cordless phone, and the like.

The following is an example in which a base station in a communication system is used as a receiving end and a user equipment is used as a transmitting end. However, the present invention is not limited thereto, and for example, the transmitting end and/or the receiving end may also be other network devices.

Example 1

The embodiment of the invention provides a random access method, which is applied to a receiving end.

FIG. 2 is a schematic diagram of a random access method according to an embodiment of the present invention, which is described from the receiving end side. As shown in FIG. 2, the random access method includes:

Step 201: The receiving end receives a random access request sent by the sending end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end.

Step 202: The receiving end determines the beam identifier according to the random access request.

Step 203: The receiving end calculates a scrambling identifier based on the beam identifier.

Step 204: The receiving end uses the scrambling identifier to perform scrambling on control information used to indicate a random access response of the sending end;

Step 205: The receiving end sends the scrambled control information and the random access response.

In this embodiment, the receiving end may be a macro base station (for example, an eNB), and the transmitting end is a user equipment; a macro cell (for example, a Macro cell) generated by the macro base station may provide a service for the user equipment. Alternatively, the receiving end may be a micro base station, the transmitting end is a user equipment, or any device capable of receiving a signal of the base station; a micro cell generated by the micro base station (for example, a Pico cell or a Small cell) may provide services for the user equipment. Alternatively, the sender and/or the receiver may also be other network devices. The present invention is not limited thereto, and a specific scenario can be determined according to actual needs.

Hereinafter, an example will be described in which a base station is used as a receiving end and a user equipment is used as a transmitting end.

FIG. 3 is another schematic diagram of a random access method according to an embodiment of the present invention, showing a basic process of random access in a multi-beam coverage scenario. For example only, the downlink transmit beam and the uplink receive beamwidth of the base station shown in FIG. 3 are different. It should be noted that the embodiment of the present invention is not limited to the basic procedure of contention based random access shown in FIG. 3, and is also applicable to a non-contention random access procedure or a simplified non-contention/contention based random access procedure.

As shown in FIG. 3, the base station may first transmit a beam-based synchronization signal (SS, Synchronization Signal)/reference signal (RS)/system information; so that the UE is based on the synchronization signal/reference signal/system information. The beam identification is selected. It may be one or more of the above information, and may further include other information such as a physical broadcast channel, etc., and the present invention is not limited thereto. That is, the UE needs to obtain the basic configuration required for downlink synchronization and random access before initiating random access.

4 is a schematic diagram of a base station transmitting beam-based information according to an embodiment of the present invention, which may include one or more of the following information: a synchronization signal, a reference signal, and system information; however, the present invention is not limited thereto.

As shown in FIG. 4, in a multi-beam coverage scenario, the base station can transmit synchronization signal/reference signal/system information, for example, by beam sweeping. The beam-based synchronization signal/reference signal/system information may include configuration information of a resource and/or a preamble and/or a RAR window for transmitting the random access request.

For example, UEs at different locations within the cell (eg, UE1 and UE2) receive synchronization signals/reference signals/system information transmitted by different beams. The PRACH and preamble configurations of the cell are indicated in the synchronization signal/reference signal/system information. The synchronization signals and/or / reference signals and/or system information transmitted by different beams may be the same or may be different. For example, different beams send different synchronization signals to distinguish different beams. For another example, system messages on different beams indicate the beam ID, PRACH, and preamble configurations of each beam.

The UE may select an appropriate beam and determine a beam identifier according to the synchronization signal and/or the reference signal and/or the system information during the cell search process, for example, the optimal downlink beam (DL beam) may be determined according to the signal strength; The invention is not limited to this.

As shown in FIG. 3, the UE sends a random access request to the base station, where the random access request explicitly or implicitly carries the beam identifier selected by the UE. For example, the UE may send a preamble on the PRACH resource of the best DL beam mapping.

In an embodiment, the random access request may implicitly carry the beam identifier selected by the UE. The beam identifier selected by the UE may correspond to a resource and/or a preamble for transmitting the random access request; or a downlink beam (DL beam for the base station, a transmit beam) and an uplink beam (UL beam for the base station) It is said that there is a fixed mapping relationship between the receiving beams. The base station may determine the beam identifier selected by the UE according to the resource and/or the preamble that sends the random access request or according to the UL beam that receives the random access request.

For example, the relationship between the DL beam and the PRACH resource configuration may include the following:

#1: Different DL beams correspond to different PRACHs (time-frequency resources).

#2: Different DL beams correspond to the same PRACH.

#3: The DL beam is divided into multiple beam groups, and the DL beams in the same beam group correspond to the same PRACH.

The UE may determine an optimal DL beam during the cell search process, and further determine the optimal DL beam corresponding to A PRACH resource set from which a PRACH resource is selected.

For another example, the relationship between different DL beam and preamble configurations may include the following:

#1: Different DL beams correspond to different preamble sets.

#2: Different DL beams correspond to the same preamble set.

#3: The DL beam is divided into multiple beam groups, and the DL beams in the same beam group correspond to the same PRACH set.

For another example, the DL beam (transmit beam) of the base station is mapped one by one with the UL beam.

In this embodiment, the UE may select a corresponding resource and/or a preamble according to the selected beam identifier. Considering different PRACH and/or preamble configurations, or mappings between DL beams and UL beams, the manner in which the base station determines the beam identifier (eg, the best DL Beam ID) selected by the UE may include the following:

When different beams correspond to different PRACHs, the base station learns the best DL beam of the UE according to the PRACH position of the preamble transmitted by the UE.

When different beams correspond to the same PRACH and different beams correspond to different preamble sets, the base station learns the best DL beam of the UE according to the preamble sent by the UE.

When the DL beam is divided into multiple beam groups, the DL beams in the same beam group correspond to the same PRACH, and the beams in the same beam group correspond to different preamble sets, the base station learns the best DL beam group of the UE according to the PRACH position. The best DL beam is then learned from the preamble sequence.

When there is a fixed mapping relationship between the DL beam (transmit) and the UL beam (reception) of the base station, the base station can learn the optimal DL beam of the UE according to the UL beam that receives the random access request.

In the non-competitive random access, if the base station already knows the best DL beam of the UE, the corresponding resource and/or preamble can be directly configured.

In another embodiment, the random access request may explicitly carry the beam identifier selected by the UE. For example, the UE can carry the data information in the random access request, and can directly report the best DL beam through the carried data.

It should be noted that the above only schematically illustrates how the random access request carries the beam identifier explicitly or implicitly. However, the present invention is not limited thereto, and other implementation manners may be used according to actual conditions.

In this embodiment, the base station may calculate a scrambling identifier based on the beam identifier.

For example, after receiving the preamble, the base station scrambles the PDCCH with the RA-RNTI carrying the beam (for example, the best DL beam) identification information in the RAR window corresponding to the random access request to indicate that the target is not With the RAR of the same beam (for example, the best DL beam), the UE uses this RA-RNTI to listen and descramble the PDCCH to receive the RAR.

The RA-RNTI can be calculated according to the time-frequency resource of the PRACH and the beam identifier (the optimal DL beam).

RA-RNTI=1+t_id+X*f_id+Y*beam_id

Where t_id is the sequence number of the first subframe in which the specified PRACH is located; f_id is the sequence number of the specified PRACH in the subframe, for example, sorted in ascending frequency domain; beam_id is the beam selected by the UE (eg, best) DL beam) identifier; X is the number of subframes in a frame; Y is an integer not less than the number of PRACH time-frequency resources in one frame.

E.g,

RA-RNTI=1+t_id+10*f_id+60*beam_id

Where 0 ≤ t_id < 10, 0 ≤ f_id < 6.

It should be noted that the foregoing only exemplifies how the RA-RNTI is specifically calculated, but the present invention is not limited thereto, and for example, t_id or f_id may be omitted. As long as the present invention can be implemented based on beam identification, the specific manner of calculation can be determined as needed, for example, the above formula can be appropriately modified or adjusted.

As shown in FIG. 3, the base station may use the scrambling identifier to scramble control information (eg, PDCCH) used to indicate the RAR of the UE; and send the scrambled control information and the RAR; The Msg3 can also be sent to the base station, and the base station can also send the Msg4 to the UE. For specific implementation details, reference may be made to the prior art, and details are not described herein again.

FIG. 5 is a diagram showing an example of a random access procedure according to an embodiment of the present invention. As shown in FIG. 5, for example, when the best DL beams of UE1, UE2, and UE3 correspond to the same PRACH resource, UE1, UE2, and UE3 adopt the most The preamble corresponding to the good DL beam sends a random access request.

In FIG. 5, it is assumed that the base station does not successfully receive the preamble transmitted by the UE2, and therefore, the base station only feeds back the RARs of the UE1 and the UE3. The RAR message sent to the UE1 is indicated by the PDCCH scrambled by the RA-RNTI_1, and the RAR message sent to the UE3 is indicated by the PDCCH scrambled by the RA-RNTI_2.

After the UE sends the preamble, the RA-RNTI calculated by using the foregoing method may be used to listen to and attempt to descramble the PDCCH in the random access response window. After detecting the scrambled PDCCH sent by the base station, the UE may learn the RAR message. Position and further decode the RAR to determine whether the preamble sent by the UE is included in the RAR message.

As described above, the base station in the embodiment of the present invention may configure different PRACH resources for different beams or beam groups. In the source and/or preamble set, the UE selects the PRACH resource/preamble set corresponding to the best DL beam to send a random access request; in the random access response window corresponding to the random access request, the base station uses the best DL beam information to carry the best DL beam information. The RA-RNTI scrambles the PDCCH to indicate RARs for different optimal DL beams, and the UE then uses this RA-RNTI to listen and descramble the PDCCH to receive the RAR.

The above describes the random access procedure in the multi-beam coverage scenario. The following describes the RAR window.

In this embodiment, the base station may configure multiple RAR windows; and send configuration information of the multiple RAR windows to the UE. The configuration information of the RAR window may be notified to the UE by using system information or radio resource control (RRC) signaling.

In this embodiment, different types of UEs may use RAR windows of different offsets or lengths. For example, UEs with different capabilities may use different RAR windows. In addition, UE types may be classified according to service types, delay requirements, and the like. For the content on the UE side, refer to Embodiment 2.

In this embodiment, the base station may determine the RAR window selected by the UE according to the random access request. For example, the RAR window selected by the UE corresponds to the resource and/or the preamble for transmitting the random access request; the base station may determine the RAR window selected by the UE according to the resource and/or the preamble that sends the random access request. For example, when the data information is carried in the random access request, the UE can directly report the selected RAR window by using the carried data.

As described above, the base station of the embodiment of the present invention may also indicate the configuration of multiple RAR windows, and the UE may select its own RAR window (eg, according to its own capabilities or service types, etc.) and use the PRACH resource/preamble (or The carried data information) can inform the base station of the RAR window used.

In non-contention random access, if the base station has acquired the type of the UE, it can be configured with corresponding resources and/or preamble and/or RAR windows.

According to the foregoing embodiment, the random access request carries the beam identifier explicitly or implicitly; the beam identifier is determined according to the random access request; the scrambling identifier is calculated based on the beam identifier; and the adding The interference indicator scrambles control information for indicating a random access response; and transmits the scrambled control information and the random access response. Thus, the random access configuration and the scrambling indicator and the like can be applied to the multi-beam coverage scenario in consideration of the beam information.

Example 2

An embodiment of the present invention provides a random access method, which is applied to a transmitting end; the same type as in Embodiment 1 is not Let me repeat.

FIG. 6 is a schematic diagram of a random access method according to an embodiment of the present invention, which is described from the transmitting end side. As shown in FIG. 6, the random access method includes:

Step 601: The sending end sends a random access request to the receiving end, where the random access request explicitly or implicitly carries the beam identifier of the sending end;

Step 602: The transmitting end calculates a scrambling identifier based on the beam identifier.

Step 603: The sending end descrambles the control information sent by the receiving end according to the scrambling identifier, and receives the random access response sent by the receiving end according to the descrambling result.

Hereinafter, an example will be described in which a base station is used as a receiving end and a user equipment is used as a transmitting end.

In this embodiment, the user equipment may receive the beam-based synchronization signal and system information sent by the base station; and select a beam identifier according to the beam-based synchronization signal.

In one embodiment, the beam identification selected by the UE may correspond to the resource and/or preamble that sent the random access request. The UE may determine a resource and/or a preamble to send the random access request according to the beam identifier.

In another embodiment, the beam identifier selected by the UE may be included in the data information carried by the random access request.

In this embodiment, the base station can also configure multiple RAR windows. The UE may receive configuration information of multiple RAR windows sent by the base station; and select one RAR window from the plurality of RAR windows.

The RAR window selected by the UE may correspond to a resource and/or a preamble that sends the random access request. Thus, the base station can determine the RAR window of the UE according to the random access request in step 601.

For example, there may be several different types of UEs within the coverage of the base station:

Type1: Only the Single TX beam is supported (that is, only omnidirectional transmission is supported, and Beamforming is not supported). For example, the preamble is sent once.

Type2: supports Multiple TX beam (that is, supports Beamforming); it can include:

Type2_1: supports reciprocity (that is, can determine UL Beam according to DL Beam), and can send 1 preamble only in the determined optimal TX beam;

Type2_2: Incomplete support/cannot predict whether reciprocity is supported (that is, UL Beam cannot be determined according to DL Beam), and preamble needs to be sent in multiple TX beams until RAR is received.

It should be noted that the above is only an example of dividing a UE based on UE capability, and the present invention is not limited thereto; It is not excluded to classify UE types by other types such as service type and delay requirement. Thus, by configuring multiple RAR windows, random access of different types of UEs can be supported.

7 is a schematic diagram of a type of UE using a longer RAR window, and FIG. 8 is a schematic diagram of a type of UE using a shorter RAR window. As shown in FIG. 7 and FIG. 8, for example, the UEs of Type 1 and Type 2_1 may select the first RAR window configuration with a longer length, and the UE of Type 2_2 may select the second RAR window configuration with a shorter length.

In addition, different types of UEs can also send preambles in different ways and select the appropriate RAR window.

FIG. 9 is a schematic diagram of a certain type of UE transmitting a preamble using different beams.

As shown in FIG. 9, after the UE of Type 2_2 transmits the preamble in the possible best TX beam, if the RAR is not received in the RAR window, the UE considers that the transmission fails. The next time the preamble is sent, the UE may use another TX beam to transmit the preamble; or, the UE transmits the preamble again through the same TX beam with higher transmission power, and if it still fails, continues to transmit with another TX beam. At this time, the UE can select a shorter length RAR window.

FIG. 10 is a schematic diagram of a type of UE continuously transmitting preambles in multiple beams.

As shown in FIG. 10, a UE such as Type 2_2 may listen to the RAR in a response window after continuously transmitting the preamble for a plurality of possible best TX beams. At this time, the UE may select a relatively large RAR window.

In another embodiment, the random access request may explicitly carry the RAR window selected by the UE. For example, the UE may carry the data information in the random access request, and may directly report the selected RAR window configuration by using the carried data.

According to the foregoing embodiment, the random access request carries the beam identifier explicitly or implicitly; the beam identifier is determined according to the random access request; the scrambling identifier is calculated based on the beam identifier; and the adding The interference indicator scrambles control information for indicating a random access response; and transmits the scrambled control information and the random access response. Thus, the random access configuration and the scrambling indicator and the like can be applied to the multi-beam coverage scenario in consideration of the beam information.

Example 3

The embodiment of the present invention provides a random access device, which is configured on the receiving end. The third embodiment corresponds to the random access method of the first embodiment, and the same content is not described herein.

FIG. 11 is a schematic diagram of a random access device according to an embodiment of the present invention. As shown in FIG. 11, the random access device 1100 includes:

a request receiving unit 1101, which receives a random access request sent by the sending end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end;

a beam identification determining unit 1102, which determines the beam identifier according to the random access request;

a scrambling identifier calculation unit 1103, which calculates a scrambling identifier based on the beam identifier;

a scrambling unit 1104 that scrambles control information for indicating a random access response of the transmitting end using the scrambling identifier;

The information transmitting unit 1105 transmits the scrambled control information and the random access response.

In an embodiment, the beam identifier selected by the transmitting end corresponds to a resource and/or a preamble for transmitting the random access request; or a fixed connection between a DL beam (transmit beam) and a UL beam (receiving beam) of the base station Mapping relations. The beam identification determining unit 1102 may determine the beam identifier selected by the transmitting end according to the resource and/or the preamble that sends the random access request, or according to the UL beam that the base station receives the random access request.

In another embodiment, the beam identifier selected by the sending end is included in the data information carried by the random access request. The beam identifier determining unit 1102 may determine the beam identifier selected by the sending end according to the data information carried in the random access request.

FIG. 12 is another schematic diagram of a random access device according to an embodiment of the present invention. As shown in FIG. 12, the random access device 1200 includes: a request receiving unit 1101, a beam identification determining unit 1102, a scrambling identification computing unit 1103, and scrambling. Unit 1104 and information transmitting unit 1105 are as described above.

As shown in FIG. 12, the random access device 1200 may further include:

a beam transmitting unit 1201 that transmits a beam-based synchronization signal and system information; such that the transmitting end selects the beam identification based on the synchronization signal.

The beam-based synchronization signal and the system information may include configuration information of resources and/or preambles for transmitting the random access request.

As shown in FIG. 12, the random access device 1200 may further include:

a window configuration unit 1202 configured with a plurality of random access response windows;

The sending unit 1203 is configured to send configuration information of multiple random access response windows to the sending end.

As shown in FIG. 12, the random access device 1200 may further include:

The window determining unit 1204 determines a random access response window selected by the transmitting end according to the random access request.

In an embodiment, the random access response window selected by the sender may correspond to a resource and/or a preamble that sends the random access request. The window determining unit 1204 may determine, according to the resource and/or the preamble that sends the random access request, a random access response window selected by the sending end.

In another embodiment, the random access response window selected by the sending end may be included in the data information carried by the random access request; the window determining unit 1204 may be carried according to the random access request. Data information, determining a random access response window selected by the sender.

According to the foregoing embodiment, the random access request carries the beam identifier explicitly or implicitly; the beam identifier is determined according to the random access request; the scrambling identifier is calculated based on the beam identifier; and the adding The interference indicator scrambles control information for indicating a random access response; and transmits the scrambled control information and the random access response. Thus, the random access configuration and the scrambling indicator and the like can be applied to the multi-beam coverage scenario in consideration of the beam information.

Example 4

The embodiment of the present invention provides a random access device, which is configured on the transmitting end. The fourth embodiment corresponds to the random access method of the second embodiment, and the same content is not described herein.

FIG. 13 is a schematic diagram of a random access device according to an embodiment of the present invention. As shown in FIG. 13, the random access device 1300 includes:

a request sending unit 1301, which sends a random access request to the receiving end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end;

a scrambling identifier calculation unit 1302, which calculates a scrambling identifier based on the beam identifier;

The information receiving unit 1303 performs descrambling on the control information sent by the receiving end according to the scrambling identifier, and receives a random access response sent by the receiving end according to the descrambling result.

In an embodiment, the beam identifier selected by the transmitting end corresponds to a resource and/or a preamble for transmitting the random access request. The request sending unit 1301 is further configured to determine, according to the beam identifier of the sending end, a resource and/or a preamble that sends the random access request.

In another embodiment, the beam identifier selected by the sending end is included in the data information carried by the random access request.

14 is another schematic diagram of a random access device according to an embodiment of the present invention. As shown in FIG. 14, the random access device 1400 includes: a request sending unit 1301, a scrambling identifier calculating unit 1302, and an information receiving unit 1303, as described above. .

As shown in FIG. 14, the random access device 1400 may further include:

a beam receiving unit 1401, which receives a beam-based synchronization signal and system information sent by the receiving end;

A beam identification selection unit 1402 selects the beam identification based on the beam-based synchronization signal.

As shown in FIG. 14, the random access device 1400 may further include:

The configuration receiving unit 1403 receives configuration information of multiple random access response windows sent by the receiving end;

The window selection unit 1404 selects a random access window of the transmitting end from the plurality of random access response windows.

In an embodiment, the random access response window selected by the sender may correspond to a resource and/or a preamble that sends the random access request. The request sending unit 1301 is further configured to determine, according to the random access response window selected by the sending end, the resource and/or the preamble that sends the random access request.

In another embodiment, the random access response window selected by the sending end may be included in the data information carried by the random access request.

According to the foregoing embodiment, the random access request carries the beam identifier explicitly or implicitly; the beam identifier is determined according to the random access request; the scrambling identifier is calculated based on the beam identifier; and the adding The interference indicator scrambles control information for indicating a random access response; and transmits the scrambled control information and the random access response. Thus, the random access configuration and the scrambling indicator and the like can be applied to the multi-beam coverage scenario in consideration of the beam information.

Example 5

The embodiment of the present invention further provides a communication system, and the same contents as those of Embodiments 1 to 4 are not described herein.

In this embodiment, the communication system may include:

a transmitting end configured with the random access device 1300 or 1400 as described in Embodiment 4;

The receiving end is configured with the random access device 1100 or 1200 as described in Embodiment 3.

FIG. 15 is a schematic diagram of a communication system according to an embodiment of the present invention, schematically illustrating setting a sending end as a user As shown in FIG. 15, the communication system 1500 may include a base station 1501 and a user equipment 1502. The base station 1501 is configured with the random access device 1100 or 1200 as described in Embodiment 3, and the user equipment 1502 is configured with the random access device 1300 or 1400 as described in Embodiment 4.

The embodiment of the present invention further provides a receiving end, which may be, for example, a base station, but the present invention is not limited thereto, and may be other network devices. The following takes a base station as an example for description.

FIG. 16 is a schematic diagram showing the structure of a base station according to an embodiment of the present invention. As shown in FIG. 16, base station 1600 can include a central processing unit (CPU) 200 and memory 210; and memory 210 is coupled to central processing unit 200. The memory 210 can store various data; in addition, a program for information processing is stored, and the program is executed under the control of the central processing unit 200.

The central processing unit 200 can be configured to implement the functions of the random access device 1100 or 1200.

For example, the central processing unit 200 may be configured to perform the following control: receiving a random access request sent by the user equipment, where the random access request explicitly or implicitly carries the beam identifier selected by the user equipment; Determining, according to the random access request, the beam identifier; calculating a scrambling identifier based on the beam identifier; and using the scrambling identifier to scramble control information used to indicate a random access response of the user equipment; Sending the scrambled control information and the random access response.

In addition, as shown in FIG. 16, the base station 1600 may further include: a transceiver 220, an antenna 230, and the like; wherein the functions of the foregoing components are similar to those of the prior art, and details are not described herein again. It should be noted that the base station 1600 also does not have to include all of the components shown in FIG. 16; in addition, the base station 1600 may also include components not shown in FIG. 16, and reference may be made to the prior art.

The embodiment of the present invention further provides a sending end, which may be, for example, a user equipment, but the present invention is not limited thereto, and may be other network devices. The following uses the user equipment as an example for description.

FIG. 17 is a schematic diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 17, the user equipment 1700 can include a central processing unit 100 and a memory 140; the memory 140 is coupled to the central processing unit 100. It should be noted that the figure is exemplary; other types of structures may be used in addition to or in place of the structure to implement telecommunications functions or other functions.

The central processing unit 100 can be configured to implement the functions of the random access device 1300 or 1400.

For example, the central processing unit 100 can be configured to perform control of transmitting a random access request to the base station, wherein the random access request explicitly or implicitly carries the beam identification selected by the user equipment; The beam identifier calculates a scrambling identifier; and the control information sent by the base station is descrambled based on the scrambling identifier, And receiving the random access response sent by the base station according to the descrambling result.

As shown in FIG. 17, the user equipment 1700 may further include: a communication module 110, an input unit 120, a display 160, and a power source 170. The functions of the above components are similar to those of the prior art, and are not described herein again. It should be noted that the user equipment 1700 does not have to include all the components shown in FIG. 17, and the above components are not required; in addition, the user equipment 1700 may further include components not shown in FIG. There are technologies.

The embodiment of the present invention further provides a computer readable program, wherein the program causes the receiving end or the base station to perform the random access method described in Embodiment 1 when the program is executed in a receiving end or a base station.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a receiving end or a base station to perform the random access method described in Embodiment 1.

The embodiment of the present invention further provides a computer readable program, wherein the program causes the transmitting end or user equipment to perform the random access method described in Embodiment 2 when the program is executed in a sending end or a user equipment. .

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a transmitting end or a user equipment to perform the random access method described in Embodiment 2.

The above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

The method/apparatus described in connection with the embodiments of the invention may be embodied directly in hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in FIG. 11 and/or one or more combinations of functional block diagrams (eg, request receiving unit, beam identification determining unit, etc.) may correspond to each of the computer program flows. Software modules can also correspond to individual hardware modules. These software modules may correspond to the respective steps shown in FIG. 2, respectively. These hardware modules can be implemented, for example, by curing these software modules using a Field Programmable Gate Array (FPGA).

The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor to enable the processor to read information from, and write information to, the storage medium; or the storage medium can be an integral part of the processor. The processor and the storage medium can be located in an ASIC. The software module can be stored in the memory of the mobile terminal, or It is stored in a memory card that can be inserted into the mobile terminal. For example, if a device (such as a mobile terminal) uses a larger capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.

One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that A person skilled in the art can make various modifications and changes to the present invention within the scope of the present invention.

Claims (20)

  1. A random access device is configured at a receiving end, where the random access device includes:
    a request receiving unit, which receives a random access request sent by the sending end, where the random access request explicitly or implicitly carries the beam identifier selected by the sending end;
    a beam identification determining unit that determines the beam identifier according to the random access request;
    a scrambling identifier calculation unit that calculates a scrambling identifier based on the beam identifier;
    a scrambling unit that scrambles control information for indicating a random access response of the transmitting end using the scrambling identifier;
    An information sending unit that transmits the scrambled control information and the random access response.
  2. The random access device of claim 1, wherein the random access device further comprises:
    a beam transmitting unit that transmits a beam-based synchronization signal and/or a reference signal and/or system information; such that the transmitting end selects the beam identification based on the synchronization signal and/or reference signal and/or system information.
  3. The random access device of claim 1, wherein the beam-based synchronization signal and/or reference signal and/or system information includes configuration information of resources and/or preambles for transmitting the random access request .
  4. The random access device according to claim 1, wherein the beam identifier selected by the transmitting end corresponds to a resource and/or a preamble for transmitting the random access request;
    The beam identifier determining unit determines a beam identifier selected by the transmitting end according to the resource and/or the preamble that sends the random access request.
  5. The random access device according to claim 1, wherein the beam identifier selected by the transmitting end is included in data information carried by the random access request;
    The beam identifier determining unit determines the beam identifier selected by the sending end according to the data information carried in the random access request.
  6. The random access device of claim 1, wherein the random access device further comprises:
    a window configuration unit configured with a plurality of random access response windows;
    And configuring a sending unit, where the configuration information of the multiple random access response windows is sent to the sending end.
  7. The random access device of claim 6, wherein the random access device further comprises:
    a window determining unit that determines a random access response window selected by the transmitting end according to the random access request.
  8. The random access device according to claim 7, wherein the random access response window selected by the transmitting end corresponds to a resource and/or a preamble for transmitting the random access request;
    The window determining unit determines a random access response window selected by the sending end according to the resource and/or the preamble that sends the random access request.
  9. The random access device according to claim 7, wherein the random access response window selected by the transmitting end is included in the data information carried by the random access request;
    The window determining unit determines a random access response window selected by the sending end according to the data information carried in the random access request.
  10. A random access device is configured at a sending end, and the random access device includes:
    a request sending unit, which sends a random access request to the receiving end, where the random access request explicitly or implicitly carries the beam identifier selected by the transmitting end;
    a scrambling identifier calculation unit that calculates a scrambling identifier based on the beam identifier;
    And an information receiving unit that performs descrambling on the control information sent by the receiving end according to the scrambling identifier, and receives a random access response sent by the receiving end according to the descrambling result.
  11. The random access device of claim 10, wherein the random access device further comprises:
    a beam receiving unit that receives a beam-based synchronization signal and/or reference signal and/or system information transmitted by the receiving end;
    A beam identification selection unit that selects the beam identification based on the beam-based synchronization signal and/or reference signal and/or system information.
  12. The random access device according to claim 10, wherein the beam identifier selected by the transmitting end corresponds to a resource and/or a preamble for transmitting the random access request.
  13. The random access device according to claim 12, wherein the request sending unit is further configured to determine, according to the beam identifier selected by the transmitting end, a resource and/or a preamble for transmitting the random access request.
  14. The random access device according to claim 10, wherein the beam identifier selected by the transmitting end is included in data information carried by the random access request.
  15. The random access device of claim 10, wherein the random access device further comprises:
    Configuring a receiving unit, which receives configuration information of multiple random access response windows sent by the receiving end;
    a window selection unit that selects random access of the transmitting end from the plurality of random access response windows window.
  16. The random access device of claim 15, wherein the random access response window selected by the transmitting end corresponds to a resource and/or a preamble for transmitting the random access request.
  17. The random access device according to claim 16, wherein the request sending unit is further configured to determine, according to the random access response window selected by the sending end, a resource and/or a preamble for transmitting the random access request.
  18. The random access device according to claim 15, wherein the random access response window selected by the transmitting end is included in the data information carried by the random access request.
  19. A communication system, the communication system comprising:
    a transmitting end configured with the random access device of claim 10;
    A receiving end configured with the random access device of claim 1.
  20. The communication system according to claim 19, wherein said transmitting end is a user equipment and said receiving end is a base station.
PCT/CN2016/101205 2016-09-30 2016-09-30 Random access apparatus, method and communications system WO2018058574A1 (en)

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CN104285385A (en) * 2012-05-10 2015-01-14 三星电子株式会社 Scheme for performing beamforming in communication system
CN104412519A (en) * 2012-07-03 2015-03-11 三星电子株式会社 Apparatus and method for random access in wireless communication system using beamforming
CN105122662A (en) * 2012-12-26 2015-12-02 三星电子株式会社 Method and apparatus for random access in communication system with large number of antennas
CN105379357A (en) * 2013-03-15 2016-03-02 高通股份有限公司 Improved random access procedure with beamforming in lte
US20160192401A1 (en) * 2014-12-29 2016-06-30 Electronics And Telecommunications Research Institute Method and apparatus for random access in communications system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104285385A (en) * 2012-05-10 2015-01-14 三星电子株式会社 Scheme for performing beamforming in communication system
CN104412519A (en) * 2012-07-03 2015-03-11 三星电子株式会社 Apparatus and method for random access in wireless communication system using beamforming
CN105122662A (en) * 2012-12-26 2015-12-02 三星电子株式会社 Method and apparatus for random access in communication system with large number of antennas
CN105379357A (en) * 2013-03-15 2016-03-02 高通股份有限公司 Improved random access procedure with beamforming in lte
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