CN110418421B

CN110418421B - Method and device for solving random access competition

Info

Publication number: CN110418421B
Application number: CN201810419115.2A
Authority: CN
Inventors: 许斌; 李秉肇; 肖潇; 曹振臻
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2021-05-11
Anticipated expiration: 2038-04-27
Also published as: CN110418421A; WO2019206101A1

Abstract

The embodiment of the application provides a method and a device for solving random access competition, relates to the field of communication, and can reduce the probability of confusion of different communication devices in the process of solving the random access competition. The method comprises the following steps: the communication equipment receives a message four sent by the network equipment in the random access process, wherein the message four comprises an MAC CE, the MAC CE is used for solving random access competition, and the length of the MAC CE is variable; the communication device determines whether the random access contention resolution of the communication device is successful according to the MAC CE. The embodiment of the application is applied to the process of random access contention resolution in LTE or UMTS.

Description

Method and device for solving random access competition

Technical Field

The present application relates to the field of communications, and in particular, to a method and an apparatus for resolving random access contention.

Background

When a User Equipment (UE) performs contention-based random access, a preamble may be first selected from a resource pool and transmitted to a base station. Due to the random nature of the selection, different UEs may select the same preamble to transmit to the base station, so that different UEs receive the same Random Access Response (RAR) transmitted by the base station. Different UEs may send the message three by using the uplink resource indicated by the uplink grant, which may cause a random access collision to the different UEs. To resolve the collision, different UEs may send a common control channel service data unit (CCCH SDU) to the base station by carrying the CCCH SDU in a message three, where the CCCH SDU may be used to distinguish different UEs. After receiving the third message sent by different UEs, the base station selects and responds to one of the third messages, carries the CCCH SDU of the third message as a control element (MAC CE) of the medium access control layer in the fourth message, and sends the fourth message to different UEs. And after receiving the message four, each UE in different UEs compares the MAC CE with the CCCH SDU in the message three, if the MAC CE is consistent with the CCCH SDU in the message three, the random access competition is determined to be successful, and if the MAC CE is inconsistent with the CCCH SDU, the random access competition is determined to be failed.

However, when the length of the CCCH SDU is long, the base station may truncate the CCCH SDU and transmit the truncated CCCH SDU to each UE as a MAC CE in a message four. The same situation may occur after the CCCH SDUs corresponding to different UEs are truncated, which leads to the situation that different UEs consider the contention resolution to be successful, thereby causing confusion of random access of different user equipments in the contention resolution process.

Disclosure of Invention

The embodiments of the present application provide a method and an apparatus for contention resolution for random access, which can reduce the probability of confusion of different communication devices (e.g., user equipment) during contention resolution for random access.

In a first aspect, an embodiment of the present application provides a method for resolving a random access contention, including: the communication equipment receives a message four sent by the network equipment in the random access process, wherein the message four comprises an MAC CE, the MAC CE is used for solving random access competition, and the length of the MAC CE is variable; the communication device determines whether the random access contention resolution of the communication device is successful according to the MAC CE.

In the embodiment of the application, the length of the MAC CE is a variable, and different communication devices can correspond to the MAC CEs with different lengths, so that the communication devices can determine whether the random access contention resolution of the communication devices is successful according to the length of the MAC CE, and thus, the network device does not need to truncate the CCCH SDU, thereby avoiding a situation that the CCCH SDUs of a plurality of communication devices are confused after being truncated (that is, the truncated CCCH SDUs are the same), and reducing the probability of confusion of different communication devices in the contention resolution process of random access.

In a possible implementation manner, before the communication device receives a message four sent by the network device in a random access process, the method further includes: the communication equipment sends a third message to the network equipment, wherein the third message comprises a CCCH SDU; the communication device determining whether the random access contention resolution of the communication device is successful according to the MAC CE includes: the communication equipment determines whether the parameters of the MAC CE are matched with the parameters of the CCCH SDU; when the communication equipment determines that the parameters of the MAC CE are not matched with the parameters of the CCCH SDU, the communication equipment determines that the random access contention resolution of the communication equipment fails; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

Therefore, when the communication equipment determines that the parameter of the MAC CE is not matched with the parameter of the CCCH SDU, the communication equipment determines that the random access contention resolution of the communication equipment fails, the specific contents of the MAC CE and the CCCH SDU do not need to be further compared, and the complexity of interpreting the contention resolution result by the communication equipment is reduced.

In one possible implementation, the method further includes: when the communication equipment determines that the parameters of the MAC CE are matched with the parameters of the CCCH SDU, the communication equipment determines whether the content of the MAC CE comprises all the content of the CCCH SDU; if the communication equipment determines that the content of the MAC CE comprises all the content of the CCCH SDU, the communication equipment determines that the random access competition solution of the communication equipment is successful; if the communication device determines that the content of the MAC CE does not include all the content of the CCCH SDU, the communication device determines that the random access contention resolution of the communication device fails.

In the embodiment of the application, since all the contents of the CCCH SDU in the message three sent by different communication devices are not the same, the situation that a plurality of communication devices consider that the random access contention resolution is successful at the same time does not occur, and the subsequent scheduling problem is avoided.

In one possible implementation, the length of the MAC CE is the same as the length of the CCCH SDU, or the length of the MAC CE is greater than the length of the CCCH SDU.

Therefore, the network device does not need to truncate the CCCH SDU, the confusion of the CCCH SDU of a plurality of communication devices after being truncated is avoided, and the confusion probability of different communication devices in the contention resolution process of random access can be reduced.

In one possible implementation, the length of the MAC CE is an integer multiple of a preset value, and the preset value is determined according to the number of bits included in one byte.

For example, the preset value may be 8, that is, the length of the MAC CE is an integer multiple of 8, which is convenient for the communication device to parse the MAC CE.

In a possible implementation manner, the MAC CE sub-header includes first indication information, where the first indication information is used to indicate a length or a type of the MAC CE, and the type of the MAC CE is related to the length of the MAC CE.

Therefore, the communication device can determine the length or the type of the MAC CE according to the first indication information without reading all bits of the MAC CE, thereby reducing the complexity of interpreting the competition resolving result by the communication device.

In one possible implementation, the first indication information is located in a reserved field or a Logical Channel Identity (LCID) field or an extended field in the MAC CE subheader.

When the first indication information is located in a reserved domain or an LCID domain in the MAC CE sub-header, the format of the MAC CE sub-header does not need to be modified, and the current communication system can be better adapted.

In a second aspect, an embodiment of the present application provides a communication device, including: a sending unit, configured to receive a fourth message sent by the network device in a random access process, where the fourth message includes an MAC CE, the MAC CE is used for resolving a random access contention, and a length of the MAC CE is a variable; a determining unit, configured to determine whether random access contention resolution of the communication device is successful according to the MAC CE.

In a possible implementation manner, the sending unit is further configured to: sending a third message to the network equipment, wherein the third message comprises a CCCH SDU; the determination unit is used for: determining whether the parameters of the MAC CE are matched with the parameters of the CCCH SDU; when the parameters of the MAC CE are determined not to be matched with the parameters of the CCCH SDU, determining that the random access competition solution of the communication equipment fails; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

In a possible implementation manner, the determining unit is further configured to: when the parameters of the MAC CE are matched with the parameters of the CCCH SDU, determining whether the contents of the MAC CE comprise all the contents of the CCCH SDU; if the content of the MAC CE is determined to include all the content of the CCCH SDU, determining that the random access competition solution of the communication equipment is successful; and if the content of the MAC CE does not comprise all the content of the CCCH SDU, determining that the random access competition solution of the communication equipment fails.

In one possible implementation, the first indication information is located in a reserved field or an LCID field or an extended field in the MAC CE subheader.

Technical effects of the second aspect and various alternative implementations thereof may be seen in the technical effects of the first aspect and various possible implementations thereof, which are not described herein in detail.

In a third aspect, an embodiment of the present invention provides an apparatus, which exists in the form of a chip product, and the apparatus includes a processor and a memory, where the memory is configured to be coupled to the processor and store necessary program instructions and data of the apparatus, and the processor is configured to execute the program instructions stored in the memory, so that the apparatus performs the functions of the communication device in the method.

In a fourth aspect, an embodiment of the present invention provides a communication device, where the communication device may implement the functions performed by the communication device in the foregoing method embodiments, and the functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the communication device has a structure including a processor and a communication interface, and the processor is configured to support the communication device to perform the corresponding functions of the method. The communication interface is used for supporting communication between the communication equipment and other network elements. The communication device may also include a memory, coupled to the processor, that retains program instructions and data necessary for the communication device.

In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform any one of the methods provided in the first aspect.

In a sixth aspect, embodiments of the present invention provide a computer program product containing instructions, which when run on a computer, cause the computer to perform any one of the methods provided in the first aspect.

In a seventh aspect, an embodiment of the present application provides a method for resolving a random access contention, including: the network equipment receives a third message sent by at least one piece of communication equipment in the random access process, wherein the third message comprises a CCCH SDU; the network device determines a target communication device from at least one communication device; and the network equipment determines the MAC CE according to the CCCH SDU in the message III sent by the target communication equipment, wherein the MAC CE is used for solving random access competition, and the length of the MAC CE is variable.

In the embodiment of the application, the length of the MAC CE may be a variable that varies according to the CCCH SDU, and different communication devices may correspond to different CCCH SDUs, so that the network device does not need to truncate the CCCH SDU, thereby avoiding a situation where the CCCH SDUs of multiple UEs are truncated and then confused (i.e., multiple truncated CCCH SDUs are the same), and being capable of reducing the probability of confusion occurring in the contention resolution process of random access by different communication devices.

In a possible implementation manner, the determining, by the network device, the MAC CE according to the CCCH SDU in the message three sent by the target communication device includes: the network equipment determines the parameters of the MAC CE according to the parameters of the CCCH SDU in the message III sent by the target communication equipment; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

Therefore, when the parameters of the MAC CE are not matched with the parameters of the CCCH SDU, the failure of the communication equipment in solving the random access competition can be determined, the specific contents of the MAC CE and the CCCH SDU do not need to be further compared, and the complexity of interpreting the competition solving result is reduced.

In a possible implementation manner, the length of the MAC CE is the same as the length of the CCCH SDU, or the length of the MAC CE is greater than the length of the CCCH SDU in the message three sent by the target communication device.

Because all the contents of the CCCH SDU in the message three sent by different communication devices are not the same, the situation that multiple communication devices consider that the random access contention resolution is successful at the same time does not occur, and the problem of subsequent scheduling is avoided.

In an eighth aspect, an embodiment of the present application provides a network device, including: a receiving unit, configured to receive a third message sent by at least one communication device in a random access process, where the third message includes a CCCH SDU; a determining unit for determining a target communication device from at least one communication device; and the determining unit is further configured to determine a MAC CE according to the CCCH SDU in the message three sent by the target communication device, where the MAC CE is used for resolving the random access contention, and the length of the MAC CE is a variable.

In one possible implementation manner, the determining unit is configured to: determining the parameters of the MAC CE according to the parameters of the CCCH SDU in the message III sent by the target communication equipment; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

Technical effects of the eighth aspect and various alternative implementations thereof may be seen in the seventh aspect and various possible implementations thereof, which are not described herein again.

In a ninth aspect, an embodiment of the present invention provides a network device, where the network device may implement the functions performed by the network device in the foregoing method embodiments, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the network device includes a processor and a communication interface, and the processor is configured to support the network device to perform the corresponding functions of the method. The communication interface is used for supporting communication between the network equipment and other network elements. The network device may also include a memory, coupled to the processor, that stores program instructions and data necessary for the network device.

In a tenth aspect, an embodiment of the present invention provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform any one of the methods provided in the seventh aspect.

In an eleventh aspect, embodiments of the present invention provide a computer program product comprising instructions, which when run on a computer, cause the computer to perform any one of the methods provided in the seventh aspect.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application;

fig. 2 is a first schematic signal interaction diagram of a method for random access contention resolution according to an embodiment of the present disclosure;

fig. 3 is a schematic format diagram of a MAC CE subheader according to an embodiment of the present application;

fig. 4 is a signal interaction diagram of a method for random access contention resolution according to an embodiment of the present application;

fig. 5 is a schematic diagram of a format of a UE ID according to an embodiment of the present application;

fig. 6 is a first schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 is a first schematic structural diagram of a network device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a base station according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides a method and a device for solving random access competition, which are applied to various wireless communication systems. For example, the embodiments of the present application may be applied to a process of random access contention resolution in Long Term Evolution (LTE) or Universal Mobile Telecommunications System (UMTS).

As shown in fig. 1, a communication system architecture provided for the embodiment of the present application is schematically illustrated, and includes a network device (e.g., a base station) and a plurality of communication devices (e.g., a terminal device 1 and a terminal device 2). For each terminal device in the plurality of terminal devices, the base station is configured to receive a third message sent by the terminal device in the random access process, where the third message includes a CCCH SDU. And the base station determines the MAC CE for solving the random access competition according to the CCCH SDU. Note that the length of the MAC CE is a variable. And then, the base station sends a message four to the terminal equipment, wherein the message four comprises the MAC CE. After each terminal device in the plurality of terminal devices receives the message four sent by the base station, whether the random access contention resolution of the terminal device is successful or not can be determined according to the MAC CE in the message four.

The network device may be a base station, which may be a device capable of communicating with the terminal device. The base station may be a relay station or an access point, etc. The base station may be a Base Transceiver Station (BTS) in a global system for mobile communication (GSM) or Code Division Multiple Access (CDMA) network, or may be an nb (nodeb) in Wideband Code Division Multiple Access (WCDMA), or may be an eNB or enodeb (evolved nodeb) in LTE. The base station may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario. The base station may also be a base station in a 5G network or a base station in a future evolution network, etc.

The communication device may be a terminal device, which may be a terminal device providing voice and/or other traffic data connectivity to a user, or a handheld device having wireless connection capability, or other processing device connected to a wireless modem. The present invention may be a portable, pocket, computer-embedded or vehicle-mounted mobile device, or may be a Personal Communication Service (PCS) phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), and other devices, which are not limited herein.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items having substantially the same function and action. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It should be noted that in the embodiments of the present invention, "of", "corresponding", and "corresponding" may be sometimes used in combination, and it should be noted that the intended meaning is consistent when the difference is not emphasized.

An embodiment of the present application provides a method for resolving random access contention, which takes a communication device as a terminal device and a network device as a base station as an example for explanation, and as shown in fig. 2, includes:

201. the terminal device sends a preamble to the base station, the preamble being used to request random access.

A plurality of terminal devices may request random access from the base station through the same preamble. For example, as shown in fig. 1, terminal device 1 and terminal device 2 may request random access from the base station through the same preamble.

202. And the base station sends a random access response to the terminal equipment, wherein the random access response comprises uplink authorization information.

And the base station receives the lead code sent by the terminal equipment. And then, the base station sends a random access response to the terminal equipment according to the lead code sent by the terminal equipment.

The size of the uplink resource indicated by the uplink grant information carried in the random access response may have different specifications in different communication systems. For example, in LTE, the protocol specifies that the uplink resource indicated by the uplink grant information carried in the random access response is 56 bits at minimum, that is, the base station may allocate any uplink resource greater than or equal to 56 bits to the terminal device.

203. And the terminal equipment sends a message III to the base station in the random access process, wherein the message III comprises the CCCH SDU.

And the terminal equipment receives the random access response sent by the base station and sends a message III to the base station according to the uplink resource indicated by the uplink authorization information in the random access response.

For example, when the resource size indicated by the uplink grant is 56 bits, the message three may contain an 8-bit MAC subheader and a 48-bit CCCH SDU. The CCCH SDU may include (carry) a cause value of 3 bits or 4 bits, a coding overhead of 4 bits, and a UE ID of 40 or 41 bits. When the UE ID includes 40 bits, the cause value includes 4 bits; when the UE ID includes 41 bits, the cause value includes 3 bits. Wherein the cause value may be used to indicate a length of the CCCH SDU. For example, as shown in table 1, in different scenarios, i.e. different RRC message types, the UE ID may include different contents.

TABLE 1

Wherein, the C-RNTI is a Temporary identifier (Cell Radio Network Temporary identity) of the terminal device in the Cell Radio Network. short MAC-I is a truncated Integrity information Authentication Code (short Message Authentication Code for Integrity). The resume ID is the recovery identity. PCI is Physical Cell identity (Physical Cell ID). S-TMSI is the Temporary UE Identity (SAE-temporal Mobile Subscriber Identity).

It should be noted that, if different terminal devices send the same preamble to the base station, different terminal devices may send a message three to the base station on the same uplink resource.

204. And the base station receives a third message sent by at least one terminal device in the random access process, wherein the third message comprises a CCCH SDU.

In one possible design, the base station may receive a message three sent by at least one terminal device on the same uplink resource. 205. The base station determines a target terminal device from at least one terminal device.

And after receiving the message III sent by at least one terminal device, the base station selects one terminal device as a target terminal device, and the target terminal device is the terminal device responded by the base station.

206. And the base station determines the MAC CE according to the CCCH SDU in the message III sent by the target terminal equipment, wherein the MAC CE is used for solving the random access competition.

Wherein, the length of the MAC CE is a variable. In one possible design, the length of the MAC CE may be a variable determined from the length of the CCCH SDU. The length of the MAC CE is greater than or equal to two.

In one possible design, the length of the MAC CE is the same as the length of the CCCH SDU. For example, assuming that the length of the CCCH SDU corresponding to the target terminal device is 48 bits, the length of the MAC CE may be 48 bits, and assuming that the length of the CCCH SDU corresponding to the target terminal device is 56 bits, the length of the MAC CE may be 56 bits.

In another possible design, the length of the MAC CE is greater than the length of the CCCH SDU. For example, the content of the MAC CE may include the content of the CCCH SDU and a certain number of padding (padding) bits, and the number of padding bits included in the MAC CE may be determined according to the number of padding bits included in the message three transmitted by the target terminal device.

In one possible design, the content of the MAC CE may include the content of the CCCH SDU and a part of redundant bits to ensure that the length of the MAC CE is an integer multiple of a preset value. Wherein the preset value is determined according to the number of bits included in one byte. For example, the preset value may be 8. Assuming that the length of the CCCH SDU is 54 bits, and the preset value is 8, the content of the MAC CE may include 48 bits and 2 redundant bits, i.e., 56 bits, of the CCCH SDU, so as to ensure that the length of the MAC CE is an integer multiple of 8, so that the UE can analyze the MAC CE.

In one possible design, the MAC CE subheader includes first indication information, and the first indication information is used to indicate a length or a type of the MAC CE. The type of the MAC CE is related to the length of the MAC CE. The length of the MAC CE is related to the length of the CCCH SDU in the message III transmitted by the target terminal equipment. For example, assuming that the length of the CCCH SDU corresponding to the target terminal device is 48 bits, the length of the MAC CE may be 48 bits, and the type of the MAC CE may be type a. Assuming that the length of the CCCH SDU corresponding to the target terminal device is 56 bits, the type of the MAC CE may be B type. Therefore, the terminal device can determine the length or the type of the MAC CE according to the first indication information without reading all bits of the MAC CE, thereby reducing the complexity of interpreting a competition resolving result by the terminal device.

In one possible design, as shown in fig. 3, the first indication information may be located in a reserved field or an LCID field or an extended field in the MAC CE subheader. The extended field may be a newly added field in the MAC CE subheader.

207. And the base station sends a message four to the terminal equipment, wherein the message four comprises the MAC CE.

208. And the terminal equipment determines whether the random access competition solution of the terminal equipment is successful or not according to the MAC CE.

The terminal equipment receives a message IV sent by the base station, and determines whether the parameters of the MAC CE in the message IV are matched with the parameters of the CCCH SDU carried in a message III sent by the terminal equipment; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

And when the terminal equipment determines that the parameters of the MAC CE are not matched with the parameters of the CCCH SDU, the terminal equipment determines that the random access competition resolving of the terminal equipment fails. And when the terminal equipment determines that the length of the MAC CE is smaller than that of the CCCH SDU, the terminal equipment determines that the random access contention resolution of the terminal equipment fails. Or, when the terminal device determines that the length of the MAC CE does not match the cause value in the CCCH SDU, that is, the terminal device determines that the length of the MAC CE is smaller than the length indicated by the cause value in the CCCH SDU, the terminal device determines that the terminal device fails to solve the random access contention. Or, when the terminal device determines that the type of the MAC CE does not match the length of the CCCH SDU, that is, the terminal device determines that the length indicated by the type of the MAC CE is smaller than the length of the CCCH SDU, the terminal device determines that the terminal device fails to solve the random access contention. Or, when the terminal device determines that the type of the MAC CE does not match the cause value in the CCCH SDU, that is, the terminal device determines that the length indicated by the type of the MAC CE is smaller than the length indicated by the cause value in the CCCH SDU, the terminal device determines that the terminal device fails to solve the random access contention.

When the terminal device determines that the parameters of the MAC CE match the parameters of the CCCH SDU, the terminal device determines whether the contents of the MAC CE include the entire contents of the CCCH SDU. And when the terminal equipment determines that the length of the MAC CE is greater than or equal to the length of the CCCH SDU, the terminal equipment determines that the parameters of the MAC CE are matched with the parameters of the CCCH SDU. Or, when the terminal device determines that the length of the MAC CE matches the cause value in the CCCH SDU, that is, the terminal device determines that the length of the MAC CE is greater than or equal to the length indicated by the cause value in the CCCH SDU, the terminal device determines that the parameter of the MAC CE matches the parameter of the CCCH SDU. Or, when the terminal device determines that the type of the MAC CE matches the length of the CCCH SDU, that is, the terminal device determines that the length indicated by the type of the MAC CE is greater than or equal to the length of the CCCH SDU, the terminal device determines that the parameter of the MAC CE matches the parameter of the CCCH SDU. Or, when the terminal device determines that the type of the MAC CE matches the cause value in the CCCH SDU, that is, the terminal device determines that the length indicated by the type of the MAC CE is greater than or equal to the length indicated by the cause value in the CCCH SDU, the terminal device determines that the parameter of the MAC CE matches the parameter of the CCCH SDU. Then, the terminal device determines whether the contents of the MAC CE include the entire contents of the CCCH SDU. If the terminal device determines that the content of the MAC CE is the same as all the content of the CCCH SDU, or the terminal device determines that the first M bits of the MAC CE are the same as all the content of the CCCH SDU, the terminal device determines that the content of the MAC CE includes all the content of the CCCH SDU. If the terminal equipment determines that the content of the MAC CE is not completely the same as the whole content of the CCCH SDU, or the terminal equipment determines that the first M bits of the MAC CE are not completely the same as the whole content of the CCCH SDU, the terminal equipment determines that the content of the MAC CE does not include the whole content of the CCCH SDU. Wherein M is a positive integer less than or equal to N. When the terminal equipment determines that the content of the MAC CE comprises all the content of the CCCH SDU, the terminal equipment determines that the terminal equipment succeeds in solving the random access competition; and when the terminal equipment determines that the content of the MAC CE does not comprise all the content of the CCCH SDU, the terminal equipment determines that the random access competition resolving of the terminal equipment fails.

In the embodiment of the application, the length of the MAC CE is variable, and different terminal devices can correspond to the MAC CEs with different lengths, so that the terminal devices can determine whether the random access contention resolution of the terminal devices is successful according to the length of the MAC CE, and thus, the base station does not need to truncate the CCCH SDU, thereby avoiding the confusion of the CCCH SDUs of multiple UEs after being truncated (that is, multiple truncated CCCH SDUs are the same), and reducing the confusion probability of different terminal devices in the contention resolution process of random access.

Further, if the parameter of the MAC CE in the message four is not matched with the parameter of the CCCH SDU in the message three, the terminal device determines that the random access contention resolution fails, and the specific contents of the MAC CE and the CCCH SDU do not need to be further compared, thereby reducing the complexity of the terminal device in interpreting the contention resolution result.

A second embodiment of the present application provides a method for resolving random access contention, which takes a communication device as a terminal device and a network device as a base station as an example, and as shown in fig. 4, includes:

401. the terminal device sends a preamble to the base station, the preamble being used to request random access.

The specific process of step 401 may refer to step 201, and is not described in detail in this embodiment of the application.

402. And the base station sends a random access response to the terminal equipment, wherein the random access response comprises uplink authorization information.

The specific process of step 402 may refer to step 202, and is not described in detail in this embodiment of the application.

403. And the terminal equipment sends a message III to the base station in the random access process, wherein the message III comprises the CCCH SDU.

The specific process of step 403 may refer to step 203, which is not described in detail in this embodiment of the application.

404. And the base station receives a third message sent by at least one terminal device in the random access process, wherein the third message comprises a CCCH SDU.

In one possible design, the base station may receive a message three sent by at least one terminal device on the same uplink resource.

405. The base station determines a target terminal device from at least one terminal device.

And after receiving the message III sent by at least one terminal device in the random access process, the base station selects one terminal device as a target terminal device, and the target terminal device is the terminal device responded by the base station.

406. And the base station determines the MAC CE according to the CCCH SDU in the message III sent by the target terminal equipment, wherein the MAC CE is used for solving the random access competition.

In one possible design, the MAC CE may include M bits of the CCCH SDU that are not completely consecutive, or the MAC CE includes the last M bits of the CCCH SDU, where M is a positive integer less than or equal to N.

In one possible design, the MAC CE may include the last M bits or M bits that are not completely consecutive of the CCCH SDU in message three sent by the target terminal device. Illustratively, when the MAC CE includes M bits of the CCCH SDU that are not completely consecutive, the MAC CE may include the first N bits and the last (M-N) bits of the CCCH SDU, where N is a positive integer less than M.

For example, in a scenario of RRC establishment recovery, as shown in fig. 5, the UE ID (i.e., I-RNTI) of the terminal device is 52 bits, the first 36 bits of the I-RNTI are the base station identifier, and the last 16 bits are the unique identifier allocated by the base station to the UE. Assuming that M is 48, since the base station identities in the I-RNTIs of different terminal devices communicating with the same base station are the same (i.e. the first 36 bits are the same), the unique identities allocated by the base station to the UE (i.e. the last 16 bits) are usually different. Therefore, compared with the method of intercepting the first 48 bits of the CCCH SDU of the target terminal equipment as the MAC CE, the method of intercepting the second 48 bits of the CCCH SDU of the target terminal equipment as the MAC CE by the base station can better reduce the confusion probability of different UEs, better solves the problem of scheduling confusion caused by that different UEs consider that the self competition resolving is successful, and can reduce the confusion probability of random access of different terminal equipment.

407. And the base station sends a message four to the terminal equipment, wherein the message four comprises the MAC CE.

408. And the terminal equipment determines whether the random access competition solution of the terminal equipment is successful or not according to the MAC CE.

If the MAC CE includes M incompletely continuous bits in the CCCH SDU, the terminal device may determine whether the M incompletely continuous bits in the MAC CE match the corresponding M incompletely continuous bits in the CCCH SDU according to a manner in which the base station intercepts the M incompletely continuous bits. If the random access contention resolution is not matched, the terminal equipment determines that the random access contention resolution of the terminal equipment is failed.

If the MAC CE includes the last M bits of the CCCH SDU, the terminal device may compare whether the last M bits of the MAC CE match the last M bits of the CCCH SDU. If the random access contention resolution is not matched, the terminal equipment determines that the random access contention resolution of the terminal equipment is failed.

Since the possibility that the rear M bits of the CCCH SDU are not repeated is higher, compared with the prior art in which the front 48 bits of the CCCH SDU of the target terminal device are intercepted as the MAC CE, the base station can better reduce the probability of confusion of random accesses of different terminal devices by intercepting the rear M (for example, M ═ 48) bits of the CCCH SDU of the target terminal device as the MAC CE.

The above description mainly introduces the solutions provided in the embodiments of the present application from the perspective of a communication device and a network device. It is to be understood that the communication device and the network device include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. Those skilled in the art will readily appreciate that the algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the communication device and the network device may be divided into the functional modules according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

A third embodiment of the present application provides a communication device, which may use the method of the first or second embodiment. The communication device may be a terminal or may be hardware implementing similar functions. The terminal includes:

and the sending unit is used for receiving a message four sent by the base station in the random access process, wherein the message four comprises an MAC CE, the MAC CE is used for solving random access competition, and the length of the MAC CE is a variable.

A determining unit, configured to determine whether random access contention resolution of the communication device is successful according to the MAC CE.

In a possible implementation manner, the sending unit is further configured to: sending a third message to the base station, wherein the third message comprises a CCCH SDU; the determination unit is used for: determining whether the parameters of the MAC CE are matched with the parameters of the CCCH SDU; when the parameters of the MAC CE are determined not to be matched with the parameters of the CCCH SDU, determining that the random access competition solution of the communication equipment fails; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

In one possible implementation, the first indication information is located in a reserved field or a logical channel identification LCID field or an extended field in the MAC CE subheader.

It is understood that the transmitting unit in the third embodiment may be a transceiving unit, and performs similar functions. And will not be described in detail herein.

When the communication device in this embodiment is a terminal, reference may be made to the device shown in fig. 6, which includes a processor 601, an application processor, a memory user interface, and other elements (including a power supply and other devices not shown). In fig. 6, the above-mentioned determining unit may be the processor 601 and performs corresponding functions. The sending unit, which may be a wireless transceiver 603 in the figure, performs corresponding functions through an antenna. It will be understood that the various elements shown in the figures are illustrative only and are not required to complete the present embodiment.

When the communication device in this embodiment is a terminal, reference may be made to the device shown in fig. 7. As an example, the device may perform a function similar to the processor of FIG. 6. In fig. 7, the apparatus includes a processor, a transmit data processor, a processor. In fig. 7, the above-mentioned determining unit may be the processor 701, and performs corresponding functions. The sending unit may be the sending data processor 703 in fig. 7, and the receiving unit may be the receiving data processor 705 in fig. 7. Although a channel encoder and a channel decoder are shown in the figure, it should be understood that these blocks are not limitative to the present embodiment, but only illustrative.

Fig. 8 shows another form of the present embodiment. The processing device 800 includes modules such as a modulation subsystem, a central processing subsystem, and peripheral subsystems. The communication device in this embodiment may act as a modulation subsystem therein. In particular, the modulation subsystem may include a processor 803 and an interface 804. Wherein the processor 803 performs the functions of the processing unit and the interface 804 performs the functions of the transmitting unit and/or the receiving unit. As another variation, the modulation subsystem includes a memory 806, a processor 803, and a program stored on the memory and executable on the processor, which when executed performs the method of one or both embodiments. It should be noted that the memory 806 may be non-volatile or volatile, and may be located within the modulation subsystem or within the processing device 800, as long as the memory 806 is connected to the processor 803.

As another form of the present embodiment, a computer-readable storage medium is provided having stored thereon instructions that, when executed, perform the method of one or both embodiments.

The fourth embodiment of the present application provides a communication device, which may use the method of the first or second embodiment. As shown in fig. 9, the communication device 900 includes:

a sending unit 901, configured to receive a message four sent by the base station in a random access process, where the message four includes a MAC CE, the MAC CE is used for resolving a random access contention, and a length of the MAC CE is a variable.

A determining unit 902, configured to determine whether random access contention resolution of the communication device is successful according to the MAC CE.

In a possible implementation manner, the sending unit 901 is further configured to: sending a third message to the base station, wherein the third message comprises a CCCH SDU; the determining unit 902 is configured to: determining whether the parameters of the MAC CE are matched with the parameters of the CCCH SDU; when the parameters of the MAC CE are determined not to be matched with the parameters of the CCCH SDU, determining that the random access competition solution of the communication equipment fails; the parameters of the MAC CE include the length and/or type of the MAC CE, and the parameters of the CCCH SDU include the length and/or cause value of the CCCH SDU.

In a possible implementation, the determining unit 902 is further configured to: when the parameters of the MAC CE are matched with the parameters of the CCCH SDU, determining whether the contents of the MAC CE comprise all the contents of the CCCH SDU; if the content of the MAC CE is determined to include all the content of the CCCH SDU, determining that the random access competition solution of the communication equipment is successful; and if the content of the MAC CE does not comprise all the content of the CCCH SDU, determining that the random access competition solution of the communication equipment fails.

Among other things, the sending unit 901 may be used to support the communication device to perform the processes 201 and 203 in fig. 2, and the processes 401 and 403 in fig. 4. Determination unit 902 is configured to support the communication device to perform process 208 in fig. 2, process 408 in fig. 4.

In a fifth embodiment of the present application, in a case that each functional module is divided according to each function, fig. 10 shows a first possible structural diagram of the network device 10 in the foregoing embodiment, where the network device 10 includes: a receiving unit 1001 and a determining unit 1002. In this embodiment of the present application, the receiving unit 1001 may be configured to receive a third message sent by at least one communication device in a random access procedure, where the third message includes a CCCH SDU. The determining unit 1002 may be configured to determine a target communication device from the at least one communication device; and determining the MAC CE according to the CCCH SDU in the message III sent by the target communication equipment, wherein the MAC CE is used for solving random access competition, and the length of the MAC CE is variable. Receiving unit 1001 is used to support network device to execute process 204 in fig. 2, and process 404 in fig. 4. Determining unit 1002 is configured to support the network device to perform processes 205 and 206 in fig. 2, and processes 405 and 406 in fig. 4. The base station may further include a transmitting unit 1003 for supporting the network device to perform process 207 in fig. 2, and process 407 in fig. 4.

In the case of an integrated unit, fig. 11 shows a second possible structural diagram of the network device involved in the above embodiment. In this application, the network device may include a processing module 1101, a communication module 1102, and a storage module 1103. The processing module 1101 is configured to control hardware devices and application software of each part of the base station; the communication module 1102 is configured to receive an instruction sent by another device using a communication method such as WiFi, and may also send data of the base station to the other device; the storage module 1103 is used for storing software programs of the base station, storing data, running software, and the like. The processing module 1101 may be a determination unit or a controller, and may be, for example, a CPU, a general purpose determination unit, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The determination unit may also be a combination implementing a calculation function, e.g. comprising one or more micro determination unit combinations, a combination of a DSP and a micro determination unit, etc. The communication module 1102 may be a transceiver, a transceiver circuit or a communication interface, etc. The storage module 1103 may be a memory.

In one possible design, the network device may be a base station. As shown in fig. 12, a schematic structural diagram of a base station provided in an embodiment of the present application includes

portions

1201 and 1202. The base station 1201 is mainly used for receiving and transmitting radio frequency signals and converting the radio frequency signals and baseband signals; the section 1202 is mainly used for baseband processing, base station control, and the like. Portion 1201 may be generally referred to as a transceiver unit, transceiver, transceiving circuitry, or transceiver, etc. Section 1202 is typically a control center of a base station, which may be generally referred to as a processing unit, for controlling the base station to perform the steps described above with respect to the base station (i.e., serving base station) in fig. 3. Reference is made in particular to the description of the relevant part above.

The transceiver unit of section 1201, which may also be referred to as a transceiver, or a transceiver, includes an antenna and a radio frequency unit, where the radio frequency unit is mainly used for radio frequency processing. Optionally, a device used for implementing a receiving function in part 1201 may be regarded as a receiving unit, and a device used for implementing a transmitting function may be regarded as a transmitting unit, that is, part 1201 includes a receiving unit and a transmitting unit. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like, and a transmitting unit may be referred to as a transmitter, a transmitting circuit, or the like.

Section 1202 may include one or more boards, each board may include one or more determining units and one or more memories, and the determining units are configured to read and execute programs in the memories to implement baseband processing functions and control of the base station. If a plurality of single boards exist, the single boards can be interconnected to increase the processing capacity. As an optional implementation, multiple boards may share one or more determining units, or multiple boards may share one or more memories, or multiple boards may share one or more determining units at the same time. The memory and the determining unit may be integrated or may be provided separately. In some embodiments,

portions

1201 and 1202 may be integrated or may be separate. In addition, all functions in the part 1202 may be integrated in one chip, or a part of functions may be integrated in one chip to implement another part of functions is integrated in one or more other chips to implement this application, which is not limited herein.

Those skilled in the art will recognize that in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a determining unit of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the determining unit of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method for random access contention resolution, comprising:

the communication equipment receives a message IV sent by network equipment in the random access process, wherein the message IV comprises a control unit MAC CE of a media access control layer, the MAC CE is used for solving random access competition, the length of the MAC CE is variable, and the MAC CE carries complete CCCH SDU;

and the communication equipment determines whether the random access contention resolution of the communication equipment is successful or not according to the MAC CE.

2. The method of claim 1, wherein before the communication device receives a message four sent by a network device in a random access procedure, the method further comprises:

the communication equipment sends a third message to the network equipment, wherein the third message comprises a common control channel service data unit (CCCH SDU);

the determining, by the communication device according to the MAC CE, whether the random access contention resolution of the communication device is successful includes:

the communication device determining whether the parameters of the MAC CE and the CCCH SDU match;

when the communication device determines that the parameter of the MAC CE does not match the parameter of the CCCH SDU, the communication device determines that the communication device fails to solve the random access contention;

wherein the parameter of the MAC CE comprises the length and/or type of the MAC CE, and the parameter of the CCCH SDU comprises the length and/or cause value of the CCCH SDU.

3. The method of claim 2, further comprising:

when the communication device determines that the parameters of the MAC CE match the parameters of the CCCH SDU, the communication device determines whether the contents of the MAC CE include the entire contents of the CCCH SDU;

if the communication equipment determines that the content of the MAC CE comprises all the content of the CCCH SDU, the communication equipment determines that the random access contention resolution of the communication equipment is successful;

if the communication device determines that the content of the MAC CE does not include all the content of the CCCH SDU, the communication device determines that the random access contention resolution of the communication device fails.

4. The method according to any of claims 1-3, wherein the length of the MAC CE is the same as the length of the CCCH SDU or the length of the MAC CE is larger than the length of the CCCH SDU.

5. The method according to any of claims 1-3, wherein the length of the MAC CE is an integer multiple of a preset value, the preset value being determined according to the number of bits comprised by one byte.

6. The method according to any of claims 1-3, wherein the MAC CE sub-header includes first indication information, and the first indication information is used to indicate a length or a type of the MAC CE, and the type of the MAC CE is related to the length of the MAC CE.

7. The method of claim 6, wherein the first indication information is located in a reserved field or a Logical Channel Identification (LCID) field or an extended field in the MAC CE subheader.

8. A method for random access contention resolution, comprising:

the network equipment receives a third message sent by at least one piece of communication equipment in the random access process, wherein the third message comprises a common control channel service data unit (CCCH SDU);

the network device determines a target communication device from the at least one communication device;

and the network equipment determines a control unit MAC CE of a media access control layer according to the CCCH SDU in the message III sent by the target communication equipment, wherein the MAC CE is used for solving random access competition, the length of the MAC CE is variable, and the MAC CE carries the complete CCCH SDU.

9. The method of claim 8, wherein the network device determining a control element MAC CE of a medium access control layer according to a CCCH SDU in a message three sent by the target communication device comprises:

the network equipment determines the parameters of the MAC CE according to the parameters of the CCCH SDU in the message III sent by the target communication equipment;

10. The method of claim 9, wherein the length of the MAC CE is the same as the length of the CCCH SDU, or wherein the length of the MAC CE is greater than the length of the CCCH SDU in the message three transmitted by the target communication device.

11. The method according to any of claims 8-10, wherein the length of the MAC CE is an integer multiple of a preset value, the preset value being determined according to the number of bits included in one byte.

12. The method according to any of claims 8-10, wherein the MAC CE sub-header includes first indication information, and the first indication information is used to indicate a length or a type of the MAC CE, and the type of the MAC CE is related to the length of the MAC CE.

13. The method of claim 12, wherein the first indication information is located in a reserved field or a Logical Channel Identification (LCID) field or an extended field in the MAC CE subheader.

14. A communication device, comprising:

a sending unit, configured to receive a fourth message sent by a network device in a random access process, where the fourth message includes a control unit MAC CE of a media access control layer, the MAC CE is used for resolving random access contention, a length of the MAC CE is a variable, and the MAC CE carries a complete CCCH SDU;

15. The communications device of claim 14, wherein the sending unit is further configured to:

sending a third message to the network device, wherein the third message comprises a common control channel service data unit (CCCH SDU);

the determination unit is configured to: determining whether the parameters of the MAC CE and the parameters of the CCCH SDU are matched;

when the parameter of the MAC CE is determined not to be matched with the parameter of the CCCH SDU, determining that the random access contention resolution of the communication equipment fails;

16. The communications device of claim 15, wherein the determining unit is further configured to:

determining whether the contents of the MAC CE include the entire contents of the CCCH SDU when it is determined that the parameters of the MAC CE match the parameters of the CCCH SDU;

if the content of the MAC CE is determined to comprise all the content of the CCCH SDU, determining that the random access competition solution of the communication equipment is successful;

and if the content of the MAC CE does not comprise all the content of the CCCH SDU, determining that the random access contention resolution of the communication equipment fails.

17. The communications device of any one of claims 14-16, wherein the length of the MAC CE is the same as the length of the CCCH SDU, or wherein the length of the MAC CE is greater than the length of the CCCH SDU.

18. The communication device according to any of claims 14 to 16, wherein the length of the MAC CE is an integer multiple of a preset value, the preset value being determined according to the number of bits included in one byte.

19. The communication device according to any of claims 14-16, wherein the MAC CE sub-header includes first indication information, the first indication information is used to indicate a length or a type of the MAC CE, and the type of the MAC CE is related to the length of the MAC CE.

20. The communications device of claim 19, wherein the first indication information is located in a reserved field or a Logical Channel Identification (LCID) field or an extended field in the MAC CE subheader.

21. A network device, comprising:

a receiving unit, configured to receive a third message sent by at least one communication device in a random access process, where the third message includes a common control channel service data unit CCCH SDU;

a determining unit configured to determine a target communication device from the at least one communication device;

the determining unit is further configured to determine a control unit MAC CE of a media access control layer according to the CCCH SDU in the message three sent by the target communication device, where the MAC CE is used for random access contention resolution, the length of the MAC CE is a variable, and the MAC CE carries the complete CCCH SDU.

22. The network device of claim 21, wherein the determining unit is configured to:

determining the parameters of the MAC CE according to the parameters of the CCCH SDU in the message III sent by the target communication equipment;

23. The network device of claim 22, wherein the length of the MAC CE is the same as the length of the CCCH SDU, or wherein the length of the MAC CE is greater than the length of the CCCH SDU in the message three sent by the target communication device.

24. The network device according to any of claims 21-23, wherein the length of the MAC CE is an integer multiple of a preset value, the preset value being determined according to the number of bits comprised by one byte.

25. The network device according to any of claims 21-23, wherein the MAC CE sub-header includes first indication information, and the first indication information is used to indicate a length or a type of the MAC CE, and the type of the MAC CE is related to the length of the MAC CE.

26. The network device of claim 25, wherein the first indication information is located in a reserved field or a Logical Channel Identification (LCID) field or an extended field in the MAC CE subheader.