CN111886918B

CN111886918B - Random access method and device

Info

Publication number: CN111886918B
Application number: CN201880091129.4A
Authority: CN
Inventors: 朱小松; 吴毅凌
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-03-19
Filing date: 2018-03-19
Publication date: 2023-03-24
Anticipated expiration: 2038-03-19
Also published as: CN111886918A; WO2019178728A1

Abstract

The application provides a random access method and a random access device, which are used for solving the problem of msg3 collision when different terminals send the same preamble at different PRACH carriers at the same time. In the method, a terminal sends a first message to a network device on a PRACH carrier, the first message comprises a lead code, and then receives a second message sent by the network device, the second message comprises an RAPID and an RAR, and the RAPID and the RAR are in one-to-one correspondence. Further, the terminal determines that the RAPID for identifying the preamble sent by the terminal exists in the second message, and analyzes the RAR corresponding to the determined RAPID, and then determines that the analyzed RAR is sent to itself by the network device when it is determined that the PRACH carrier identified by the identification information included in the analyzed RAR is the same as the PRACH carrier used by the terminal when sending the first message.

Description

Random access method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a random access method and apparatus.

Background

In a narrowband internet of things (NB-IoT) system, before a terminal and a base station establish Radio Resource Control (RRC) connection, a random access procedure needs to be initiated to the base station. Specifically, the base station may broadcast a system message, where the system message is used to indicate a random access resource used by the terminal to initiate a random access process, and specifically includes a Physical Random Access Channel (PRACH) carrier and a preamble. Each PRACH carrier in the NB-IoT system is mapped with a unique preamble, and the bandwidth of the PRACH carrier is 3.75KHz. After receiving the system message, the terminal may select a PRACH carrier, and send a random access request (msg 1) including a preamble corresponding to the PRACH carrier on the PRACH carrier. Accordingly, after receiving msg1, the base station may send a random access response (msg 2) to the terminal, where the msg2 includes a Random Access Preamble Identifier (RAPID) and a corresponding Random Access Response (RAR). After receiving msg2, the terminal identifies whether the preamble identified by the RAPID is the same as the preamble sent by the terminal, so as to judge whether msg2 contains the RAR fed back by the base station, if so, the terminal can send an RRC connection request (msg 3) to the base station according to the uplink authorization indicated in the RAR.

Different from the random access resource allocation mode of the existing NB-IoT system, the PRACH carrier and the preamble in the 230MHz IoT system are not configured into a one-to-one mapping relationship, so the random access resource in the 230MHz IoT system is divided into two dimensions, one dimension is the PRACH carrier, and the other dimension is the preamble. This may be the case when different terminals select the same preamble at the same time and transmit msg1 on different PRACH carriers, respectively. In this case, msg1 sent by different terminals includes the same preamble, and correspondingly, msg2 fed back by the base station includes RAPID for identifying the same preamble. Then, after detecting msg2, different terminals can all judge that msg2 contains RAPID that is the same as preamble sent by themselves, which will cause a situation that different terminals select uplink grant indicated in the same RAR to send msg3, resulting in a conflict when different terminals send msg3.

Disclosure of Invention

The application provides a random access method and a random access device, which are used for solving the problem of msg3 collision when different terminals send the same preamble at different PRACH carriers at the same time.

In a first aspect, the present application provides a random access method, in which a terminal sends a first message including a preamble to a network device on a PRACH carrier, and receives a second message sent by the network device, where the second message includes an RAPID and a RAR, and the RAPID and the RAR correspond to each other one to one. Further, the terminal determines that an RAPID for identifying a preamble sent by the terminal exists in the second message, and parses a RAR corresponding to the determined RAPID, and further determines that the parsed RAR is sent to the terminal by the network device when it is determined that a PRACH carrier identified by identification information included in the parsed RAR is the same as a PRACH carrier utilized by the terminal when sending the first message.

In the method, in the process of random access by a terminal and a network device, after the terminal receives a second message fed back by the network device and judges that an RAPID identifying a lead code sent by the terminal exists in the second message, judgment on identification information contained in a RAR corresponding to the RAPID is added, and when it is determined that a PRACH carrier identified by the identification information is the same as a PRACH carrier used when the terminal sends a first message, the RAR corresponding to the RAPID is confirmed to be sent to the terminal by the network device. Thus, even if different terminals select the same preamble at the same time and respectively transmit msg1 on different PRACH carriers, the terminals can determine which RAR belongs to the terminals by judging the identification information in the RARs, so that the occurrence of collision when different terminals transmit msg3 can be effectively avoided.

In a possible design, after receiving the second message sent by the network device, the terminal determines that the RAR sent by the network device to the terminal is not included in the second message when determining that the RAPID for identifying the preamble does not exist in the second message.

Or after the terminal analyzes the RAR corresponding to the determined RAPID, when it is determined that the PRACH carrier identified by the identification information included in the analyzed RAR is different from the PRACH carrier utilized by the terminal when the terminal transmits the first message, it is determined that the second message does not include the RAR transmitted to the terminal by the network device.

In the above design, when it is determined that the second message sent by the network device does not include the RAPID for identifying the preamble sent by the terminal, or it is determined that the identification information in the RAR corresponding to the RAPID does not identify the PRACH carrier index used when the terminal sends the first message, the terminal may determine that the second message does not include the RAR of the terminal, thereby avoiding that the RAR sent by the network device to another terminal is mistakenly considered to be sent to itself, and effectively avoiding the collision problem when msg3 is sent.

In one possible design, the identification information is a PRACH carrier index.

In the above design, the PRACH carrier may be effectively identified by the PRACH carrier index, so that the terminal may confirm whether the RAR is sent to the terminal by comparing whether the PRACH carrier index used when the terminal sends the first message is the same as the PRACH carrier index included in the RAR.

In one possible design, the RAR included in the second message further includes an uplink grant, a temporary cell radio network temporary identifier, and a time advance command.

In the above design, the RAR may further include, in addition to identification information for identifying a PRACH carrier, related resources used when the terminal sends msg3, so that the terminal initiates an RRC connection procedure to the network device.

In a second aspect, the present application provides a random access method, in which a network device receives a first message sent by a terminal on a PRACH carrier, where the first message includes a preamble. Further, the network device sends a second message to the terminal, where the second message includes a random access preamble identifier RAPID used to identify a preamble sent by the terminal, and a random access response RAR corresponding to the RAPID, and the RAR includes identification information used to identify the PRACH carrier.

In the method, in the process of random access by the terminal and the network device, after receiving the first message sent by the terminal, the network device may add identification information for identifying a PRACH carrier in the RAR corresponding to the RAPID for identifying the preamble sent by the terminal included in the second message when feeding back the second message, so that even if different terminals select the same preamble at the same time and respectively send msg1 on different PRACH carriers, the terminal may determine which RAR belongs to itself by judging the identification information in the RAR, thereby effectively avoiding collision when different terminals send msg3.

In the above design, the network device may effectively identify the PRACH carrier through the PRACH carrier index, so that the terminal determines whether the RAR is sent to the terminal by comparing whether an index value of the PRACH carrier used when the terminal sends the first message is the same as the PRACH carrier index included in the RAR.

In a possible design, the RAR further includes an uplink grant, a temporary cell radio network temporary identifier, and a time advance command.

In a third aspect, the present application provides a communication device, where the communication device has a function of implementing the terminal according to the first aspect, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible implementation manner, the communication device includes a processing unit and a transceiver unit, and functions executed by the transmitting unit and the processing unit may correspond to steps executed by the terminal according to the first aspect, which is not described herein again.

In another possible implementation manner, the communication device includes a processor and a transceiver, and the processor may control the transceiver to send and receive signals to implement the method performed by the terminal in the first aspect and any possible implementation manner of the first aspect.

In another possible embodiment, the apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data for implementing the terminal functions referred to in the first aspect above. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the terminal in the first aspect and any possible implementation manner of the first aspect.

In a fourth aspect, the present application provides a communication apparatus, wherein the communication apparatus has a function of implementing the network device according to the second aspect, and the function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

In a possible implementation manner, the communication apparatus includes a processing unit and a transceiver unit, and functions performed by the transmitting unit and the processing unit may correspond to steps performed by the network device related to the second aspect, which are not described herein again.

In another possible implementation, the communication device includes a processor and a transceiver, and the processor may control the transceiver to send and receive signals to perform the method performed by the network device in the second aspect and any possible implementation of the second aspect.

In another possible embodiment, the apparatus may further comprise one or more memories for coupling with the processor, which stores the necessary computer program instructions and/or data to implement the functions of the network device according to the second aspect. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The processor may execute the computer program instructions stored in the memory to perform the method performed by the network device in the second aspect and any possible implementation manner of the second aspect.

In a fifth aspect, the present application provides a communication system comprising at least one terminal according to the first aspect and a network device according to the second aspect.

In a sixth aspect, the present application provides a chip, which may be connected to a memory, and configured to read and execute program codes stored in the memory to implement the random access method in the foregoing aspects and any possible designs of the aspects.

In a seventh aspect, the present application provides a computer storage medium for storing a program or instructions which, when run on a computer, performs the random access method as referred to in the above aspects and in any possible design of the aspects.

Drawings

Fig. 1 is a schematic spectrum distribution diagram of a 230MHz IoT system provided in an embodiment of the present application;

fig. 2 is a network architecture diagram of a 230MHz IoT system according to an embodiment of the present disclosure;

fig. 3a is a schematic diagram illustrating selection of a random access resource when a terminal initiates a random access process according to an embodiment of the present application;

fig. 3b is a schematic diagram illustrating selection of a random access resource when different terminals initiate a random access process according to an embodiment of the present application;

fig. 4 is a flowchart illustrating a random access method according to an embodiment of the present application;

fig. 5 is a schematic diagram of a message format of msg2 according to an embodiment of the present application;

FIG. 6a is a diagram illustrating a MAC RAR field in a prior art NB-IoT system;

fig. 6b is a schematic structural diagram of a MAC RAR field in a 230MHz IoT system according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a communication device 700 according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device 800 according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a communication device 900 according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a communication device 1000 according to an embodiment of the present disclosure.

Detailed Description

Embodiments of the present application will be described below with reference to the accompanying drawings.

In order to better understand the technical solutions provided in the embodiments of the present application, an application scenario of the embodiments of the present application is first described below.

The embodiment of the application can be applied to NB-IoT systems, such as 230MHz IoT systems. Fig. 1 illustrates a spectrum distribution diagram of a 230MHz IoT system provided by an embodiment of the present application. The 230MHz IoT system comprises 223 MHz-235 MHz, total 12MHz bandwidth frequency band, and comprises 480 carriers with 25KHz bandwidth.

Fig. 2 illustrates a network architecture diagram of a 230MHz IoT system provided in an embodiment of the present application, which includes a terminal, a network device, and a core network. The network device is for example a base station. The terminal can access the base station, and further realizes the communication with the network element of the core network through the base station.

The terminal in the system may be any device that provides voice and/or data connectivity to a user, and may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, unmanned aerial vehicles or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), mobile Stations (MS), terminals (terminal equipment), transmission points (TRP or transmission points, TP), and the like.

The base station in the system may be any device for accessing the terminal to the wireless network, including but not limited to: an evolved node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved node B or home node B, HNB), a Base Band Unit (BBU), a wireless fidelity (WIFI) Access Point (AP), a Transmission Point (TP), a continuously evolved node B (gNB), and the like.

The embodiments of the present application relate to communications between a terminal and a base station, and in particular, to a random access procedure between a terminal and a base station. For ease of understanding, before describing the random access procedure of the 230MHz IoT system, the features of the lower 230MHz IoT system random access resource are first described. Different from the random access resource of the existing NB-IoT system, the PRACH carrier and the preamble in the 230MHz IoT system are not configured into a one-to-one mapping relationship, so the random access resource in the 230MHz IoT system is divided into two dimensions, one dimension is the PRACH carrier, the bandwidth of the PRACH carrier is 25KHz, and the other dimension is the preamble. In view of the above characteristics of the random access resource, when the terminal initiates the random access procedure, the random access resource needs to be selected from two dimensions, which can be specifically shown in fig. 3 a. The PRACH carrier and preamble shown in fig. 3a are available random access resources indicated in the system message broadcast by the base station. Each preamble corresponds to a preamble index, and each PRACH carrier corresponds to a PRACH carrier index. After receiving the system message, the terminal may select a PRACH carrier and a preamble used for initiating a random access procedure. Specifically, the terminal may select the preamble used for initiating the random access procedure by selecting the preamble index, for example, the terminal may select the preamble with the preamble index of preamble # n, and may further send msg1 including the preamble with the preamble index of preamble # n on the selected PRACH carrier. However, in this way of selecting random access resources from two dimensions, it is easy for different terminals to select different PRACH carriers at the same time but select the same preamble.

For example, as shown in fig. 3b, it is assumed that the random access resource includes M PRACH carriers having carrier indexes of 0 to (M-1), and N preambles having preamble indexes of preamble #0 to preamble # (N-1). In radio frame number (SFN) # p, terminal 1 selects a PRACH carrier with carrier index carrier # k and a preamble with preamble index preamble # i, and terminal 2 selects a PRACH carrier with carrier index carrier # l and a preamble with preamble index preamble # i. Wherein M, N, i, k and l are positive integers. In this case, the terminal 1 and the terminal 2 transmit msg1 including preamble with preamble # i to the base station on PRACH carriers corresponding to carrier # k and carrier # l, respectively. The corresponding initial radio frame numbers when the terminal 1 and the terminal 2 transmit msg1 are the same, and random access radio network temporary identifiers (RA-RNTIs) calculated by the terminal 1 and the terminal 2 by using the initial radio frame numbers are also the same. Correspondingly, after receiving the msg1 sent by the terminal 1 and the terminal 2, the base station may also calculate the same RA-RNTI according to the starting radio frame number because the corresponding starting radio frame numbers when the terminal 1 and the terminal 2 send the msg1 are the same.

Further, the base station replies msg2 to the terminal 1 and the terminal 2, where the msg2 includes a RAPID for identifying the preamble sent by the terminal 1 and the terminal 2, and a RAR corresponding to the RAPID. Then, after detecting msg2, both terminal 1 and terminal 2 may determine that msg2 includes RAPID for identifying preamble sent by terminal 1 and terminal 2, and both consider that RAR corresponding to the RAPID is own. Therefore, terminal 1 and terminal 2 may select the uplink grant indicated in the same RAR to transmit msg3, which may cause a collision when msg3 is transmitted.

Based on this, the embodiments of the present application provide a random access method, so as to solve the msg3 collision problem occurring when different terminals transmit the same preamble on different PRACH carriers at the same time.

Fig. 4 is a schematic flowchart of a random access method provided in an embodiment of the present application, where the method includes:

step 401: the base station broadcasts a system message to the terminal, wherein the system message is used for indicating the random access resource used when the terminal initiates the random access process.

Wherein the random access resource comprises at least one PRACH carrier and at least one preamble. Each preamble corresponds to a preamble index, and each PRACH carrier corresponds to a PRACH carrier index.

Step 402: and the terminal selects the PRACH carrier and the preamble used for initiating the random access process from the random access resources indicated by the received system message.

Specifically, the terminal may select the PRACH carrier used for initiating the random access procedure by selecting the PRACH carrier index, and select the preamble used for initiating the random access procedure by selecting the preamble index.

Step 403: and the terminal sends a first message (namely msg 1) on the selected PRACH carrier, wherein the msg1 comprises a preamble selected by the terminal.

Step 404: and the base station sends a second message (namely msg 2) to the terminal, wherein the msg2 comprises RAPID and RAR, and the RAPID corresponds to the RAR one by one.

Specifically, the msg2 message format may refer to a Media Access Control (MAC) Protocol Data Unit (PDU) shown in fig. 5, where the MAC PDU includes a MAC header (MAC header), a plurality of MAC RARs, and possibly padding (padding). Wherein the MAC header may include at least one MAC PDU subheader. Wherein, the sub-header of the Backoff Indicator (BI) includes 5 fields E/T/R/BI, and the sub-headers of the other MAC PDUs include 3 fields E/T/RAPID. Wherein each MAC PDU subheader corresponds to one MAC RAR except for the BI subheader. Padding may occur after the last MAC RAR, whether padding is needed is determined by the transport block size, the MAC header size, and the number of RARs.

Wherein, each field in the MAC PDU subheader has the following meanings:

e: an extension field indicating whether there are additional fields in the MAC header.

T: a type field indicating whether PRAID or BI is contained in the MAC subheader.

R: reserved bits, set to "0".

BI: a fallback indication field indicating that the cell is in an overload state.

RAPID: a preamble identification field for identifying a preamble.

Referring to fig. 6a, a schematic structural diagram of a MAC RAR field in an NB-IoT system in the prior art is shown, where the MAC RAR field includes a timing advance command (timing advance command) field, an uplink Grant (UL Grant), a Temporary cell-radio network Temporary identifier (Temporary cell-radio network Temporary identifier, and a R field. The timing advance command field is mainly used for a Timing Advance (TA) value of uplink synchronization of the terminal. The UL Grant is mainly used for indicating an uplink resource when the terminal transmits msg3, and specifically includes parameters such as a Physical Uplink Shared Channel (PUSCH) carrier index, repetition times, and scheduling delay. The Temporary C-RNTI is mainly used for indicating the terminal to scramble the PUSCH by using the value when msg3 is subsequently transmitted.

In the embodiment of the present application, in order to distinguish PRACH carriers used when a terminal sends a preamble, identification information for identifying the PRACH carrier may be added to an MAC RAR. Specifically, referring to the schematic structural diagram of the MAC RAR field in the 230MHz IoT system provided in the embodiment of the present application shown in fig. 6b, the original R field may be configured as identification information for identifying a PRACH carrier, and the identification information may be, for example, a PRACH carrier index. It should be understood that the field structure of the RAR message provided in this embodiment is merely an exemplary illustration, and in actual use, the field structure may also be adjusted.

Step 405: after receiving msg2, the terminal analyzes the RAPID contained in msg2 and judges whether the preamble identified in the analyzed RAPID is the same as the preamble sent by the terminal.

If yes, continuing to execute steps 406-407; if not, continue to step 409.

Step 406: and the terminal determines that the RAPID used for identifying the preamble sent by the terminal exists in the second message and analyzes the RAR corresponding to the RAPID.

Step 407: and the terminal judges whether the PRACH carrier identified by the identification information included in the analyzed RAR is the same as the PRACH carrier utilized when the terminal sends the preamble.

Specifically, when the identification information is represented by a PRACH carrier index, the terminal may determine whether the RAR is sent to itself by the base station by comparing whether the carrier index of the PRACH carrier used when the terminal sends msg1 is the same as the carrier index of the PRACH carrier identified by the identification information included in the RAR.

If yes, go on to step 408; if not, continue to step 409.

Step 408: the terminal confirms that the analyzed RAR is sent to the terminal by the base station.

Step 409: the terminal confirms that the RAR transmitted to itself by the base station is not included in msg 2.

So far, the terminal can accurately judge whether there is an RAR sent to itself by the base station in msg2 based on RAPID and the identification information for identifying the PRACH carrier included in the RAR. If so, the subsequent terminal may send msg3 on the uplink resource indicated by the uplink grant in the RAR.

In the embodiment of the application, in the process of random access by a terminal and a base station, after the terminal receives msg2 fed back by the base station and judges that there is an RAPID identifying preamble sent by the terminal in msg2, judgment on identification information contained in a RAR corresponding to the RAPID is added, and when it is determined that a PRACH carrier identified by the identification information is the same as a PRACH carrier used when the terminal sends msg1, the RAR corresponding to the RAPID is confirmed to be sent to the terminal by the base station. Therefore, even if different terminals select the same preamble at the same time and respectively transmit msg1 on different PRACH carriers, the terminals can determine which RAR is transmitted to the terminals by the base station through the judgment of the identification information in the RAR, so that the conflict can be effectively avoided when different terminals transmit msg3.

The random access scheme provided in the embodiments of the present application is illustrated below with reference to specific application scenarios.

With reference to the scenario diagram shown in fig. 3b, after the terminal 1 and the terminal 2 respectively send msg1 containing preamble with preamble index of preamble # i to the base station on PRACH carriers corresponding to carrier # k and carrier # l, RAPID for identifying preamble with preamble index of preamble # i and corresponding RAR may be packaged in msg2 replied by the base station. Here, it is assumed that the RAR includes identification information for identifying a PRACH carrier whose carrier index is carrier # k.

Then, after receiving msg2, the terminal 1 may first analyze a RAPID for identifying the preamble with preamble # i as the preamble index, and further analyze an RAR corresponding to the RAPID. Further, the terminal 1 may determine that the carrier index carrier # k of the PRACH carrier identified by the identification information included in the analyzed RAR is the same as the carrier index carrier # k of the PRACH carrier used when the terminal 1 transmits msg1, so the terminal 1 may determine that the RAR is transmitted to the terminal 1 by the base station. The terminal 2 may refer to the above procedure to determine that the RAR is not transmitted from the base station to the terminal 2. Subsequent terminal 1 may send msg3 according to the uplink resource indicated by the ULgrant in the RAR, while terminal 2 does not send msg3 in the uplink resource indicated by the ULgrant in the RAR, which may effectively avoid a collision when msg3 is sent.

Based on the same technical concept, the embodiment of the application also provides a communication device, and the device has the corresponding functions of realizing the terminal related to the embodiment of the method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 7 shows a schematic structural diagram of a communication apparatus 700 provided in an embodiment of the present application, where the apparatus 700 may include a processing unit 701 and a transceiver unit 702. The processing unit 701 is configured to control the transceiver unit 702 to send a first message to the network device on the PRACH carrier, where the first message includes a preamble. Further, the processing unit 701 is further configured to control the transceiver unit 702 to receive a second message sent by the network device, where the second message includes an RAPID and an RAR, and the RAPID and the RAR are in one-to-one correspondence. Further, the processing unit 701 is further configured to determine that an RAPID for identifying the preamble exists in the second message, analyze an RAR corresponding to the determined RAPID, and determine that the analyzed RAR is sent to the communication device 700 by the network device when it is determined that a PRACH carrier identified by identification information included in the analyzed RAR is the same as a PRACH carrier utilized when the communication device 700 sends the first message.

In a possible implementation manner, after controlling the transceiver unit 702 to receive the second message sent by the network device, the processing unit 701 may confirm that the RAR sent by the network device to the communication apparatus 700 is not included in the second message when determining that the RAPID for identifying the preamble does not exist in the second message.

Alternatively, after analyzing the RAR corresponding to the determined RAPID, the processing unit 701 may confirm that the RAR sent by the network device to the communication device 700 is not included in the second message when determining that the PRACH carrier identified by the identification information included in the analyzed RAR is different from the PRACH carrier used by the communication device 700 when sending the first message.

In one possible embodiment, the identification information is a PRACH carrier index.

In a possible implementation manner, the RAR included in the second message further includes an uplink grant, a temporary cell radio network temporary identifier, and a time advance command.

Fig. 8 shows a schematic structural diagram of a communication device 800 according to an embodiment of the present application, where the communication device 800 may include a processor 801 and a transceiver 802. Wherein the processor 801 is configured to support the terminal to perform the functions involved in the above method embodiments. The transceiver 802 is configured to support messaging functions for the terminals. The communication device 800 may further comprise a memory 803, the memory 803 being adapted to be coupled to the processor 801 and storing computer program instructions and/or data necessary for the terminal. Wherein, the processor 801, the transceiver 802 and the memory 803 are connected, the memory 803 is used for storing the necessary computer program instructions for implementing the functions of the terminal involved in the above method embodiments, and the processor 801 is used for executing the computer program instructions stored in the memory 803 to control the transceiver 802 to transmit and receive signals, so as to complete the steps of the terminal in the above method embodiments for executing the corresponding functions.

Specifically, the processor 801 is configured to control the transceiver 802 to transmit a first message to the network device on the PRACH carrier, where the first message includes a preamble. Further, the processor 801 controls the transceiver 802 to receive a second message sent by the network device, where the second message includes a random access preamble identifier RAPID and a random access response RAR, where RAPID and RAR are in one-to-one correspondence. Further, the processor 801 determines that the RAPID for identifying the preamble exists in the second message, analyzes the RAR corresponding to the determined RAPID, and determines that the analyzed RAR is sent to the communication apparatus 800 by the network device when it is determined that the PRACH carrier identified by the identification information included in the analyzed RAR is the same as the PRACH carrier used by the communication apparatus 800 when sending the first message.

In a possible implementation, after controlling the transceiver 802 to receive the second message sent by the network device, the processor 801 may confirm that the RAR sent by the network device to the communication apparatus 800 is not included in the second message when determining that the RAPID for identifying the preamble does not exist in the second message.

Alternatively, after the processor 801 parses the RAR corresponding to the determined RAPID, when it is determined that the PRACH carrier identified by the identification information included in the parsed RAR is not the same as the PRACH carrier used by the communication apparatus when transmitting the first message, it may be determined that the RAR transmitted to the communication apparatus 800 by the network device is not included in the second message.

Based on the same technical concept, the embodiment of the present application further provides another communication apparatus, where the apparatus has a corresponding function of implementing the network device related to the above method embodiment. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.

Fig. 9 shows a schematic structural diagram of a communication apparatus 900 according to an embodiment of the present application, where the communication apparatus 900 may include a processing unit 901 and a transceiver unit 902. The processing unit 901 may be configured to control the transceiving unit 902 to receive a first message sent by a terminal on a PRACH carrier, where the first message includes a preamble. Further, the processing unit 901 is further configured to control the transceiver unit 902 to send a second message to the terminal, where the second message includes a RAPID for identifying the preamble and a RAR corresponding to the RAPID, and the RAR includes identification information for identifying the PRACH carrier.

In one possible implementation, the identification information is a PRACH carrier index.

In a possible implementation, the RAR further includes an uplink grant, a temporary cell radio network temporary identifier, and a time advance command.

Fig. 10 shows a schematic structural diagram of a communication device 1000 according to an embodiment of the present application, where the communication device 1000 may include a processor 1001 and a transceiver 1002. Wherein the processor 1001 is configured to support a network device to perform the functions involved in the above method embodiments. The transceiver 1002 is configured to support messaging functions of network devices. The communications apparatus 1000 may also include a memory 1003, the memory 1003 being configured to couple with the processor 1001 and to store computer program instructions and/or data necessary for the network device. The processor 1001, the transceiver 1002 and the memory 1003 are connected, the memory 1003 is used for storing computer program instructions necessary for implementing the functions of the network device involved in the above method embodiments, and the processor 1001 is used for executing the computer program instructions stored in the memory 1003 to control the transceiver 1002 to transmit and receive signals, so as to complete the steps of the network device in the above method embodiments for executing the corresponding functions.

Specifically, the processor 1001 may be configured to control the transceiver 1002 to receive a first message sent by a terminal on a PRACH carrier, where the first message includes a preamble. Further, the processor 1001 is further configured to control the transceiver 1002 to send a second message to the terminal, where the second message includes a RAPID for identifying the preamble and a RAR corresponding to the RAPID, and the RAR includes identification information for identifying the PRACH carrier.

It is understood that the drawings of the embodiments of the present application only show simplified designs of the terminal and the network device. In practical applications, the terminal and the network device are not limited to the above structure, and may further include an antenna array, a duplexer, and a baseband processing section, for example.

It should be noted that the processor referred to in the embodiments of the present application may be a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, 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. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The memory referred to above in the embodiments of the present application may be integrated in the processor, or may be provided separately from the processor.

According to the method provided by the embodiment of the present application, an embodiment of the present application further provides a communication system, which includes the foregoing network device and at least one terminal.

The embodiment of the present application further provides a chip, where the chip may be connected to a memory, and is configured to read and execute a program code stored in the memory, so as to implement any one of the methods related to the foregoing terminal or the foregoing network device.

The embodiments of the present application also provide a computer storage medium for storing programs or instructions, and when the programs or instructions are executed, the random access method related to the terminal or the network device may be completed.

Embodiments of the present application further provide a computer program product for storing a computer program, where the computer program is configured to execute the random access method in the foregoing method embodiments.

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 processor 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 processor 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.

Claims

1. A random access method, comprising:

a terminal sends a first message to network equipment on a Physical Random Access Channel (PRACH) carrier, wherein the first message comprises a lead code;

the terminal receives a second message sent by the network equipment, wherein the second message comprises a random access preamble identifier RAPID and a random access response RAR, and the RAPID and the RAR are in one-to-one correspondence;

the terminal determines that an RAPID used for identifying the lead code exists in the second message, and analyzes an RAR corresponding to the determined RAPID;

the terminal determines that the analyzed RAR is sent to the terminal by the network equipment when judging that the PRACH carrier identified by the identification information included in the analyzed RAR is the same as the PRACH carrier utilized by the terminal when sending the first message; wherein, the identification information is PRACH carrier index.

2. The method of claim 1, wherein after the terminal receives the second message sent by the network device, the method further comprises:

when determining that the RAPID for identifying the preamble does not exist in the second message, the terminal determines that the second message does not include the RAR sent to the terminal by the network device; alternatively, the first and second electrodes may be,

after the terminal analyzes the RAR corresponding to the determined RAPID, when judging that the PRACH carrier identified by the identification information included in the analyzed RAR is different from the PRACH carrier utilized by the terminal when the terminal sends the first message, the terminal confirms that the second message does not include the RAR sent to the terminal by the network equipment.

3. The method according to claim 1 or 2, wherein the RAR included in the second message further includes an uplink grant, a temporary cell radio network temporary identity, and a time advance command.

4. A random access method, comprising:

the method comprises the steps that network equipment receives a first message sent by a terminal on a Physical Random Access Channel (PRACH) carrier, wherein the first message comprises a lead code;

the network equipment sends a second message to the terminal, wherein the second message comprises a random access preamble identifier RAPID used for identifying the preamble and a random access response RAR corresponding to the RAPID, and the RAR comprises identification information used for identifying the PRACH carrier; wherein, the identification information is PRACH carrier index.

5. The method of claim 4, wherein the RAR further comprises an uplink grant, a temporary cell radio network temporary identity, a time advance command.

6. A communications apparatus, comprising: a processor and a transceiver;

the processor is configured to control the transceiver to send a first message to a network device on a Physical Random Access Channel (PRACH) carrier, where the first message includes a preamble;

the processor is further configured to control the transceiver to receive a second message sent by the network device, where the second message includes a random access preamble identifier RAPID and a random access response RAR, and the RAPID and the RAR are in one-to-one correspondence;

the processor is further configured to determine that a RAPID for identifying the preamble exists in the second message, and resolve a RAR corresponding to the determined RAPID;

the processor is further configured to determine that the resolved RAR is sent to the communication apparatus by the network device when it is determined that the PRACH carrier identified by the identification information included in the resolved RAR is the same as the PRACH carrier used by the communication apparatus when sending the first message; wherein, the identification information is PRACH carrier index.

7. The communications apparatus of claim 6, wherein the processor, after controlling the transceiver to receive the second message sent by the network device, is further configured to:

when determining that the RAPID for identifying the preamble does not exist in the second message, the processor confirms that the RAR sent by the network device to the communication device is not included in the second message; alternatively, the first and second liquid crystal display panels may be,

after the processor analyzes the RAR corresponding to the determined RAPID, when it is determined that the PRACH carrier identified by the identification information included in the analyzed RAR is not the same as the PRACH carrier utilized by the communication apparatus when the communication apparatus transmits the first message, it is determined that the RAR transmitted to the communication apparatus by the network device is not included in the second message.

8. The communications device according to claim 6 or 7, wherein the RAR included in the second message further includes an uplink grant, a temporary cell radio network temporary identity, a time advance command.

9. A communications apparatus, comprising: a processor and a transceiver;

the processor is configured to control the transceiver to receive a first message sent by a terminal on a Physical Random Access Channel (PRACH) carrier, where the first message includes a preamble;

the processor is configured to control the transceiver to send a second message to the terminal, where the second message includes a random access preamble RAPID for identifying the preamble and a random access response RAR corresponding to the RAPID, and the RAR includes identification information for identifying the PRACH carrier; wherein, the identification information is PRACH carrier index.

10. The communications apparatus of claim 9, the RAR further comprising an uplink grant, a temporary cell radio network temporary identity, a time advance command.

11. A computer storage medium comprising a program or instructions for performing the method of any one of claims 1 to 5 when the program or instructions are run on a computer.