WO2011160519A1 - 一种随机接入控制方法及*** - Google Patents
一种随机接入控制方法及*** Download PDFInfo
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- WO2011160519A1 WO2011160519A1 PCT/CN2011/074445 CN2011074445W WO2011160519A1 WO 2011160519 A1 WO2011160519 A1 WO 2011160519A1 CN 2011074445 W CN2011074445 W CN 2011074445W WO 2011160519 A1 WO2011160519 A1 WO 2011160519A1
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- random access
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- information
- backoff
- mac pdu
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- 238000000034 method Methods 0.000 title claims abstract description 64
- 230000004044 response Effects 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000009827 uniform distribution Methods 0.000 claims description 19
- 238000009826 distribution Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
Definitions
- the present invention relates to the field of wireless communication technologies, and in particular, to a random access control method and system.
- H2H communication refers to communication between people. It is the communication of people through the operation of the device.
- the existing wireless communication technology is developed based on H2H communication.
- M2M machine-to-machine communication. Broadly defined is a networked application and service centered on intelligent interaction of machine terminals.
- Machine to Machine (M2M) is an intelligent machine terminal that provides customers with information solutions by means of multiple communication methods. It is used to satisfy customers' monitoring, command and dispatch, data collection and measurement. And other information needs.
- M2M Machine to Machine
- the development of wireless technology is an important factor in the development of the M2M market.
- M2M can be applied to industrial applications, home applications, and personal applications. Industry applications such as: traffic monitoring, warning systems, marine rescue, vending machines, and paying for cars. Home applications such as: automatic meter reading, and temperature control.
- M2M mobile terminals such as: life detection and remote diagnosis.
- the plurality of M2M mobile terminals (Machine Type Communication (MTC) device, MD, or MTC Equipment, ME) form a group, and the network can perform common charging, Quality of Service (QoS) control, and paging operations on M2M mobile terminals belonging to one group.
- MTC Machine Type Communication
- QoS Quality of Service
- paging operations on M2M mobile terminals belonging to one group.
- MDs in a group have common attributes, the above group-based operations will greatly save network resource overhead and bring Convenience.
- Random access is one of the most basic functions of a terminal in a wireless communication system, which makes it possible to establish a connection between the terminal and the network.
- Random access based on the competition mode is applicable in the following application process: initial access in the radio resource control IDLE (RRC IDLE) state; initial access after the radio link error; and radio resource control In the connection (RRC_CONNECTED) state, when there is uplink data transmission.
- RRC IDLE radio resource control IDLE
- RRC_CONNECTED radio resource control In the connection
- Step 1 The user equipment (User Equipment, UE) sends a random access preamble; before the UE initiates the random access request, the UE randomly selects from the available random access transmission opportunities. A transmission opportunity is selected to randomly select a preamble from the available preamble set with a medium probability and transmit the selected preamble to the base station (eNodeB, eNB).
- Step 2 The eNB feeds back a random access response message to the UE.
- the eNB If the eNB correctly solves the preamble, the eNB feeds back a corresponding Random Access Response (RAR) according to the preamble, and the random access response message may be referred to as message 2 (msg2).
- RAR Random Access Response
- message 2 message 2
- the structure of the RAR MAC PDU is shown in Figure 1.
- the RAR MAC PDU consists of 1 MAC header and 0, 1 or more MAC RARs, and optional padding.
- the MAC header consists of one backoff subheader, zero, one or more RAR subheaders.
- the backoff subheader includes a backoff value, and each RAR subheader corresponds to each MAC RAR.
- the role of the backoff value is to prevent the UE that fails the random access from initiating the second random access immediately. Instead, after waiting for a period of time, a second random access is initiated, which can reduce the probability of access collision and reduce access congestion.
- Step 3 The terminal feedback message 3 (msg3); after receiving the RAR corresponding to the preamble sent by the UE, the UE feeds back the message 3, and the message 3 includes the identity code of the UE.
- Step 4 Competing for resolution; Since in step 1, it may happen that multiple UEs use the same preamble, in which case, these UEs will send their own identity codes to the eNB in step three, when If the eNB receives more than one UE identity code corresponding to the same preamble, the eNB will know that an access collision, or access competition, has occurred on the preamble. The eNB may select one of these competing UEs, and include its identification information in the contention resolution message and send it back to the UE. When the competing UE does not find its own identification information in the competition resolution message, it will know that this random access competition has failed.
- the UE sets the backoff value of the UE side to 0 during the initialization process before the random access is initiated. If the RAR MAC PDU received by the UE does not include a backoff sub-header, the backoff value of the UE side is set to 0. If the RAR MAC PDU received by the UE includes a backoff sub-header, the backoff value in the backoff sub-header is used.
- the UE If the UE does not receive the RAR corresponding to itself, it considers that the random access response fails to be received. If the random access is based on the contention mode (that is, the preamble is selected by the MAC layer of the UE), then the UE will After the delay is delayed according to the backoff value, the random access is performed again.
- the method for determining the length of the delay time is as follows: According to the principle of uniform distribution, a random value is taken between 0 and backoff values, and the random value is used as the UE delay time. The length value.
- the UE will delay the access according to the backoff value for a period of time, and then perform a random access.
- the delay time is determined as above.
- Backoff subheader The structure of the Backoff subheader is shown in Figure 2. It includes: "E”: If “ ⁇ ”, there are other subheaders after the subheader; if it is "0", it represents Behind this subheader is MAC RAR or padding;
- T If " ⁇ ”, it means that the subheader is the backoff subheader; if it is not “1”, it means that the subheader is the RAR subheader (there is no "BI” field in the RAR subheader, but the "RAPID” field. , wherein the preamble sequence number corresponding to the RAR subheader is placed;
- R reserved bit, set to 0, the old version of the UE will not read these reserved bits
- the access preamble resources in the network may not be used enough, resulting in a large number of MTC terminals.
- An access conflict occurs. Therefore, when the eNB detects that the network load becomes heavy, the eNB determines the random access behavior of the terminal in the time domain by adjusting the backoff value to reduce the access collision probability.
- LTE Long Term Evolution
- the range of the currently specified backoff value is mainly defined for the terminal of H2H (human-to-human) communication.
- H2H human-to-human
- the inventor of the present application finds that: the existing backoff value domain can discretize the random access behavior of the terminal to some extent, but under the absolute number of M2M terminals (the number of M2M terminals in one cell may be the number of H2H terminals) More than 10 times), the access collision probability of the network may still be unable to meet the service quality requirements of the operation.
- the types of services of M2M terminals are far more than those of H2H terminals, the requirements for random access of various service types are very different (some have greater tolerance for access delay, some are smaller), and different.
- the access priority of the service is also different.
- the use of the same backoff value for such a plurality of types of M2M terminals and H2H terminals may result in a high probability of occurrence of an access collision between different types of terminals.
- the service sensitivity will be seriously affected.
- the technical problem to be solved by the present invention is to provide a random access control method and system, an access network gateway, and a RAR MAC PDU, which can reduce the access collision probability of the terminal.
- the present invention provides a random access control method, where the method includes: the access network element performs a plurality of random access backoff values for each category classified by the terminal; The element transmits a random access response medium access control protocol data unit (RAR MAC PDU) to the terminal, the RAR MAC PDU includes information of a random access backoff value set by classification; and the terminal is in the RAR MAC PDU according to its own category. Find the corresponding random access backoff value for random access delay processing.
- RAR MAC PDU random access response medium access control protocol data unit
- the terminal classification manner is one or a combination of the following manners: according to whether the terminal is an H2H terminal, classified into an H2H terminal and a non-H2H terminal; classified according to a terminal group; Classification of service types, one terminal has one or more service types; classified according to the access priority of the terminal, one terminal has one or more access priorities; and classified according to the protocol version of the terminal.
- the information about the random access backoff value set by the classification includes a first flag, where the first flag is used to indicate whether there is information about a random access backoff value set by the classification in the RAR MAC PDU.
- the first flag is set in a reserved bit of the backoff subheader of the RAR MAC PDU, or is set at a beginning position after the last random access response in the RAR MAC PDU.
- whether the random access fallback value of the classification setting in the RAR MAC PDU is implicitly indicated by one of the following methods:
- the terminal and the network agreed that the RAR MAC PDU necessarily includes the random access backoff value set by the classification; and the terminal and the network convention, if there is a backoff subheader in the RAR MAC PDU, the RAR MAC PDU includes the random access back of the classification setting. If there is no back-off sub-header in the RAR MAC PDU, the RAR MAC PDU does not include the random access back-off value set by the classification.
- the method further includes:
- the access network element allocates a dedicated random access preamble for the classification of different terminals; and the access network element detects the random access preamble sent by the terminal, and determines the category to which the terminal belongs; In the step of transmitting the RAR MAC PDU by the terminal, the access network element stores only the information of the random access backoff value corresponding to the category to which the terminal belongs in the RAR MAC PDU sent to the terminal.
- the terminal is divided into an H2H terminal and a non-H2H terminal, and the information of the random access fallback value set by the classification includes a category identifier, where the category identifier is used to indicate whether there is a random access fallback of the non-H2H terminal.
- the information of the value, the category identifier is set separately or combined with a first flag, and the first flag is used to indicate whether there is information about the random access backoff value set by the classification in the RAR MAC PDU.
- the information about the random access backoff value set by the classification includes information of one or more category identifiers and corresponding random access backoff values.
- each category identifier includes a category identifier value and a second flag, where the second flag is used to indicate whether there is another category identifier behind the category identifier, and the random access fallback value corresponding to each category identifier
- the information is sorted in the order of the category identification after all the category identifiers, or immediately after the respective category identifiers.
- the information about the random access backoff value set by the classification includes a third flag, where the third flag is used to indicate whether the RAR MAC PDU includes the information of the random access backoff value of all categories of the terminal. If the third flag indicates "Yes”, the information of the random access backoff value set by the classification further includes information of a random access backoff value of each category arranged in a predetermined order; The flag indicates "No", and the information of the random access backoff value set by the classification further includes information of one or more category identifiers and their corresponding random access backoff values.
- the information of the random access backoff value is a sequence number of a random access backoff value, and each sequence number corresponds to a random access backoff value of one level, and the terminal is divided into an H2H terminal and a non-H2H terminal, and
- the value range of the H2H terminal is greater than or equal to the value of the random access backoff value of the H2H terminal, and the number of random access backoffs is greater than or equal to the number of random access backoffs of the H2H terminal.
- the terminal classification is based on whether it is an H2H terminal or a terminal group classification, and the information of the random access backoff value corresponding to the H2H terminal is placed in the backoff subheader, and the non-H2H terminal or the non-H2H terminal corresponds to each packet.
- the information of the random access backoff value is placed after the last RAR of the RAR MAC PDU.
- the information of the random access backoff value set by the classification includes a flag, a classification category identifier, and a corresponding identifier of the information indicating whether a random access backoff value of the classification setting is set in the RAR MAC PDU.
- the classification setting The information of the random access backoff value is set after the last RAR in the RAR MAC PDU.
- the method further includes: after the access network element decrypts the random access preamble of the terminal, selecting not to send, send a part, or send all the classification settings.
- the information of the random access backoff value is set in one of the following manners:
- the non-H2H terminal is classified into the service type or the access priority of the terminal, and the information of the random access rollback value corresponding to the H2H terminal is placed in the backoff subheader.
- the information of the random access backoff value corresponding to the priority classification is placed after the last RAR of the RAR MAC PDU;
- the service type or access priority of the terminal is classified.
- the information of the random access rollback value of the original protocol version of the H2H terminal is placed in the backoff subheader.
- the information of the random access backoff value corresponding to the service type or the access priority class is placed after the last RAR of the RAR MAC PDU.
- the step of the terminal searching for the corresponding random access fallback value in the RAR MAC PDU to perform the random access delay processing according to the self category includes: the terminal searching according to the information of the random access backoff value corresponding to the self category Corresponding random access fallback value, the random access backoff value of the terminal side is set to the detected random access backoff value; and the competition fails when the terminal receives the RAR failure or the competitive access, and there is no The maximum number of times the preamble is transmitted is reached, and the terminal calculates the delay time of the next random access according to the current random access backoff value of the terminal side and a predetermined rule.
- the step of the terminal calculating the delay time of the next random access according to the current random access backoff value and the predetermined rule on the terminal side includes: when calculating the random access delay time, according to the principle of uniform distribution at 0 Randomly take a value between the random access backoff values; or the terminal classifies according to H2H and non-H2H, and calculate the random access delay time, such as the terminal.
- the received RAR MAC PDU includes the information of the random access backoff value backoff! of the H2H terminal, and the information of the random access backoff value backofG of the non-H2H terminal, and the H2H terminal follows the uniform distribution principle from 0 to backoff.
- the incoming delay time randomly takes a value between 0 to the random access backoff value of the current level and the random access backoff value of the previous level according to the principle of uniform distribution; or, the random access delay time of each level is followed according to The principle of the uniform hook distribution randomly takes a value between the random access backoff value of the previous level and the random access backoff value of the previous level + the random access backoff value of the previous level; or, each level Machine average access delay time in accordance with the principle of distribution of the front hook of a random access backoff value between the present value of the random access backoff stage takes a random value.
- the present invention further provides a random access control system
- the system includes: a setting module, configured to: set multiple random access backoff values for each category classified by the terminal; And setting: the random access response medium access control protocol data unit (RAR MAC PDU) sent to the terminal includes information of a random access backoff value set by classification; and a searching module, and according to the terminal's own category Finding a corresponding random access backoff value in the RAR MAC PDU for random access delay processing.
- the information about the random access backoff value set by the sending module by the sending module includes a first flag, where the first flag is used to indicate whether there is a random access backoff value set by the classification in the RAR MAC PDU.
- the first flag is set in the reserved bit of the backoff subheader of the RAR MAC PDU or at the beginning of the last random access response in the RAR MAC PDU.
- the message of the random access backoff value set by the classification sent by the sending module includes one or more of a flag for "indicating whether there is information of a random access fallback value set by the classification in the RAR MAC PDU", a classification category identifier, and information of a corresponding random access backoff value,
- the information of the random access backoff value set by the classification is set after the last RAR in the RAR MAC PDU.
- the present invention further provides a random access response medium access control protocol data unit (RAR MAC PDU) sent by an access network element to a terminal, where the RAR MAC PDU includes:
- the RAR MAC PDU includes the information of the random access fallback value set by the classification, where the information of the random access backoff value set by the classification is a plurality of randomized categories set by the access network element for each category of the terminal classification.
- the access value is accessed, so that the terminal searches for the corresponding random access backoff value in the RAR MAC PDU according to its own category to perform random access delay processing.
- the terminal classification manner is one or a combination of the following manners: according to whether the terminal is classified by an H2H terminal, and is classified into an H2H terminal and a non-H2H terminal; and classified according to a terminal group; Classification of service types initiated by the terminal, one terminal has one or more service types; classified according to the access priority of the terminal, one terminal has one or more access priorities; and classified according to the protocol version of the terminal.
- the information about the random access backoff value set by the classification includes a first flag, where the first flag is used to indicate whether there is information about a random access backoff value set by the classification in the RAR MAC PDU.
- the first flag is set in a reserved bit of the backoff subheader of the RAR MAC PDU, or is set at a beginning position after the last random access response in the RAR MAC PDU.
- whether the random access backoff value of the classification setting in the RAR MAC PDU is implicitly indicated by one of the following methods: The terminal and the network agreed that the RAR MAC PDU necessarily includes the random access backoff value set by the classification; and the terminal and the network convention, if there is a backoff subheader in the RAR MAC PDU, the RAR MAC PDU includes the random access back of the classification setting.
- the RAR MAC PDU does not include the random access back-off value set by the classification.
- the information of the random access backoff value set by the classification includes a category identifier, where the category identifier is used to indicate whether there is a random connection of the non-H2H terminal.
- the category identifier is set separately or combined with a first flag, and the first flag is used to indicate whether there is information about the random access back-off value set by the classification in the RAR MAC PDU.
- the information of the random access backoff value set by the classification includes information of one or more category identifiers and their corresponding random access backoff values.
- each category identifier includes a category identifier value and a second flag, where the second flag is used to indicate whether there is another category identifier behind the category identifier, and the random access back corresponding to each category identifier
- the information of the depreciation is arranged in the order of the category identification after all the category identifiers, or immediately after the corresponding category identifiers.
- the information about the random access backoff value set by the classification includes a third flag, where the third flag is used to indicate whether the random access backoff value of all categories of the terminal is included in the RAR MAC PDU.
- the information of the random access backoff value set by the classification further includes information of a random access backoff value of each category arranged in a predetermined order;
- the third flag indicates "No", and the information of the random access backoff value set by the classification further includes information of one or more category identifiers and their corresponding random access backoff values.
- the information of the random access backoff value is a sequence number of a random access backoff value, and each sequence number corresponds to a random access backoff value of one level, and the terminal is divided into an H2H terminal and a non-H2H terminal.
- the value range of the non-H2H terminal is greater than or equal to the value of the random access backoff value of the H2H terminal, and the number of random access backoffs is greater than or equal to the random access of the H2H terminal.
- the terminal classification is only according to whether it is a terminal or a terminal group classification, and the information of the random access backoff value corresponding to the terminal is placed in the backoff subheader, and the non- ⁇ 2 ⁇ terminal or the non- ⁇ 2 ⁇ terminal The information of the random access backoff value corresponding to the packet is placed after the last RAR of the RAR MAC PDU.
- the information of the random access backoff value set by the classification includes a flag, a classification category identifier, and a “information for indicating whether a random access backoff value of a classification setting exists in a RAR MAC PDU” And one or more of the information of the corresponding random access backoff value, where the information of the random access backoff value set by the classification is set after the last RAR in the RAR MAC PDU.
- the terminal classification is classified according to the service type or access priority initiated by the terminal, and the information of the random access backoff value is set in one of the following manners:
- the non-H2H terminal is classified into the service type or the access priority of the terminal, and the information of the random access rollback value corresponding to the H2H terminal is placed in the backoff subheader.
- the information of the random access backoff value corresponding to the priority classification is placed after the last RAR of the RAR MAC PDU;
- the service type or access priority of the terminal is classified.
- the information of the random access rollback value of the original protocol version of the H2H terminal is placed in the backoff subheader.
- the information of the random access backoff value corresponding to the service type or the access priority class is placed after the last RAR of the RAR MAC PDU.
- the present invention further provides an access network element, where the access network element includes: a setting module, which is configured to: set multiple random access fallbacks for each category classified by the terminal And a sending module, configured to: include, in a random access response medium access control protocol data unit (RAR MAC PDU) sent to the terminal, information of a random access backoff value set by classification, so that the terminal According to the terminal's own category, the corresponding random access backoff value is searched in the RAR MAC PDU for random access delay processing.
- the information about the random access fallback value set by the sending module in the access network element includes the first flag, where the first flag is used to indicate whether there is a random connection of the classification setting in the RAR MAC PDU. Entering the information of the back-off value, the first flag is set in the reserved bit of the back-off sub-header of the RAR MAC PDU, or is set at the beginning position after the last random access response in the RAR MAC PDU.
- the information about the random access backoff value set by the classification sent by the sending module in the access network element includes the information for indicating whether there is a random access backoff value of the classification setting in the RAR MAC PDU.
- One or more of the flag, the classification category identifier, and the information of the corresponding random access fallback value, and the information of the random access backoff value set by the classification is set after the last RAR in the RAR MAC PDU.
- the present invention sets different backoff values for different terminal types, service types, and access priorities, so that random access of different types of terminals is properly distributed in the time domain, which can greatly reduce the access collision probability of the terminal.
- the competition between random access resources of different types or different levels of terminals can be reduced, thereby reducing access congestion.
- FIG. 1 is a structural diagram of a prior art RAR MAC PDU
- FIG. 2 is a structural diagram of a prior art Backoff subheader
- FIG. 3 is a structural diagram of a RAR MAC PDU according to an embodiment of the present invention
- FIG. 5 is a schematic diagram of setting a flag after a last RAR of a RAR MAC PDU according to an embodiment of the present invention
- FIG. 6 is a structural diagram of a RAR MAC PDU classified according to whether a terminal is an H2H terminal class according to an embodiment of the present invention
- FIG. 7 is a structural diagram of a RAR MAC PDU classified according to a terminal packet according to an embodiment of the present invention
- FIG. 8 is a structural diagram of a RAR MAC PDU classified according to a service type or an access priority initiated by a terminal according to an embodiment of the present invention
- FIG. 9 is a service type or an access priority initiated by a terminal according to an embodiment of the present invention
- FIG. 10 is a flowchart of a random access control method according to an embodiment of the present invention.
- Step 1 The access network element sets multiple random access backoff values (hereinafter referred to as backoff values) for each category classified by the terminal.
- backoff values multiple random access backoff values
- Each random access backoff value corresponds to one or more categories; the manner of terminal classification may be, but is not limited to, one or a combination of the following manners:
- the terminal is an H2H terminal, including: H2H terminal and non-H2H terminal, for example, the M2M terminal is a non-H2H terminal, as shown in the following table:
- terminals belonging to different groups belong to different categories, as shown in the following table.
- Service type 1 (service class/type 1) Backoff service type 2 of service type 1 Backoff service type of service type 2 Backoff of service type N Since one terminal can The one or more service types are initiated. Therefore, the terminal needs to select the backoff value delivered by the eNB according to the service type that is required to be established when the random access is initiated. That is, it means that a terminal may apply multiple backoff values.
- the access priority is determined by the network side and the terminal.
- the access priority can be determined according to the call type or the service type.
- One call type or service type can correspond to one access priority, or multiple call types or service types can be used.
- Priority of the access for example: The emergency call type corresponds to the high access priority, and the calling data service type corresponds to the low priority. After the M2M service is introduced, there may be more service types, and the access priority of some service types. May be the same as the calling data service type;
- the H2H terminal can be divided into two categories: the H2H terminal and the non-H2H terminal.
- the non-H2H terminal can be divided into multiple subclasses according to the terminal group or the service type initiated by the terminal or the access priority of the terminal. No longer divided.
- determining the backoff value of each category it can be based on the classification principle and the network load situation. Consider it together.
- the backoff can be configured to be smaller; or for a service type with a large access delay tolerance, the backoff can be configured larger; or, when the access load or service data load is higher
- the backoff value should be set larger to reduce the number of newly accessed terminals and avoid further increase in load.
- the corresponding backoff value can also be adjusted according to the access load or the traffic data load.
- Step 2 The access network element sends the information of the backoff value set by the classification to the terminal.
- the information of the backoff value set by the classification is included in the RAR MAC PDU sent to the terminal.
- the network element of the access network may select the information of the backoff value of some or all categories, for example: when the network load is light, the eNB may not set backoff for the H2H terminal or the terminal with high access priority (ie, backoff is 0). The backoff is set only for the M2M terminal or the terminal with a low access priority. In this case, the eNB does not need to send the H2H terminal or the backoff of the high access priority to save signaling overhead.
- the access network element may allocate a dedicated random access preamble for the classification of different terminals, for example: designating one or more random access preambles for the H2H terminal, and one or more random access preambles for the M2M. Terminal-specific; or specify one or more random access preambles for a particular service type, and so on.
- the access network element After the access network element detects the random access preamble sent by the terminal, it can know which type of terminal initiates the random access, so that only the information of the backoff value corresponding to the category to which the terminal belongs is placed in the RAR MAC PDU. .
- the method of FIG. 3 can be used to set a new backoff information unit to accommodate the classification after the last RAR of the RAR MAC PDU.
- Information about the backoff value set including one or more of the following:
- the flag of the message is placed at the beginning position after the last RAR in the RAR MAC PDU, and the terminal can judge whether it is necessary to read the subsequent content, that is, the category identifier and the information of the backoff value of the classification setting according to the flag.
- the flag for "information indicating whether or not there is a backoff value of the classification setting in the RAR MAC PDU" may be set in the backoff subheader of FIG.
- Whether the information of the backoff value of the classification setting exists in the RAR MAC PDU may be indicated in an explicit or implicit manner:
- the explicit indication method includes, but is not limited to, setting a flag (Flag) in the RAR MAC PDU, the flag indicating whether there is information of the backoff value of the classification setting in the RAR MAC PDU.
- the flag can be set at the beginning of the last RAR in the RAR MAC PDU, as shown in FIG. 5: where "new backoff" represents the backoff value of the classification setting, where "E” represents the current RAR MAC PDU.
- Whether there is a backoff value of the classification setting for example: "E" is 0, indicating that there is no backoff value of the classification setting in the current RAR MAC PDU; otherwise, there is a backoff value of the classification setting.
- the length of the logo can be 1 or more digits.
- the flag may also be set in a reserved bit of the backoff subheader of the RAR MAC PDU (the backoff subheader in the text refers to the backoff subhead of the prior art, refer to FIG. 1), as shown in FIG. 4A and FIG. 4B.
- the length of the flag may be 1 or 2 bits, and the definition may be: Flag is 0: indicates that there is no backoff value of the classification setting in the current RAR MAC PDU; Flag is not 0: indicates that the current RAR MAC PDU exists.
- the backoff value of the classification setting; the above definition is one of the examples, and of course, there may be other definitions, which do not affect the essence of the present invention.
- the foregoing flag is not required, and an implicit manner may be used to indicate whether there is information about the backoff value of the classification setting in the current RAR MAC PDU.
- the implicit rule may be one of the following:
- the RAR MAC PDU must contain information on the backoff value of the classification settings
- the RAR MAC PDU also contains information about the backoff value set by the classification. If there is no backoff subheader in the RAR MAC PDU, the RAR MAC PDU does not contain the classification setting. The information of the backoff value.
- the information of the backoff value of the classification setting in the RAR MAC PDU can be represented by the information of the category identifier and its corresponding backoff value.
- the class identification and the aforementioned flag for "information indicating whether or not there is a backoff value of the classification setting in the RAR MAC PDU" may be set in the RAR MAC PDU or may be combined and set in the RAR MAC PDU.
- the merging setting in the RAR MAC PDU means setting a flag, which may indicate information of the category identifier, or information indicating whether "the information of the backoff value of the classification setting exists in the RAR MAC PDU".
- flag is added to the reserved bit of the backoff sub-header of the RAR MAC PDU, where flag is 0, indicating that there is no non-H2H terminal backoff in the current RAR MAC PDU; 0 indicates that there is a non-H2H terminal backoff, where T is 1 indicating that there is information of the backoff value of the H2H terminal, and T is 0 indicating that there is no information of the backoff value of the H2H terminal.
- Figure 4B differs from Figure 4A in that the reserved bits are different.
- the RAR MAC PDU contains the special category identifiers of various terminals.
- the classification identifier may represent a group identifier, a service type identifier, or an access priority level identifier.
- each category identifier includes a flag in addition to the category identifier value, and the flag is used to indicate whether there is another category identifier behind the category identifier; as shown in FIG.
- the flag indicates "yes” as 1, then Indicates that there is one or more other category identifiers after the category identifier; if the flag is a value indicating “No”, such as 0, it indicates that the category identifier is followed by information of the backoff value corresponding to the first category identifier.
- the backoff values corresponding to the category identifiers are sequentially arranged after each category identifier in the order of the category identification. Of course, the backoff value corresponding to the category identifier can also follow the category identifier.
- the classification category identifier and the foregoing flag for "indicating whether there is a classification backoff in the RAR MAC PDU may be set in the RAR MAC PDU, respectively, or may be combined and set in the RAR MAC PDU. That is, a flag is used to simultaneously indicate the classification category information. And information about whether there is a classified backoff value in the RAR MAC PDU. Optionally, a flag is set to indicate whether the RAR MAC PDU contains information of backoff values of all categories: If the flag indicates "Yes", The current RAR MAC PDU does not need to include the category identifier to save the signaling overhead.
- the information of the backoff value of each category may be arranged in the order of the order after the flag; if not, the RAR MAC PDU needs to be in the The flag includes a category identifier.
- the terminal can determine, according to the flag, whether the RAR MAC PDU includes information of backoff values of all categories, and if yes, information about backoff values of each category can be obtained in an agreed order, if not, The information of the corresponding backoff value is found according to the category identifier therein.
- the representation of the information of different types of backoff values is: •
- the backoff value is divided into multiple levels, corresponding to different backoff numbers, in RAR
- the information of the backoff value in the MAC PDU is the sequence number of the backoff value.
- the terminal finds the corresponding backoff value according to the correspondence between the backoff value and the sequence number of the backoff value.
- the value of the backoff value of the non-H2H terminal is greater than or equal to the value of the backoff of the H2H terminal.
- the number of backoffs of the non-H2H terminal may be greater than or equal to the number of backoffs of the H2H terminal. .
- the number of levels divided by the backoff value can be set to the following table:
- the backoff time span of Table 2 is larger than that of the prior art, which can make the terminal select a larger range when selecting the random access delay, and reduce the probability of the access conflict between different types of terminals.
- the value of Table 2 is only one of the examples. There may be other values defined. It is only necessary to design the backoff value according to the principles of the present invention.
- the access network element After determining which classes of backoff values are to be sent, the access network element fills the sequence numbers of these backoff values into the RAR MAC PDU. If the terminal is classified according to whether the terminal is an H2H terminal, the information of the backoff value corresponding to the H2H terminal may be placed in the backoff subheader, and the information of the backoff value corresponding to the non-H2H terminal (for example, the M2M terminal) is placed after the last RAR of the RAR MAC PDU. .
- the backoff value corresponding to the H2H terminal may be placed in the backoff subheader, and the backoff corresponding to each packet of the non-H2H terminal (for example, the M2M terminal) is placed after the last RAR of the RAR MAC PDU, as shown in the figure. 7 is shown. If you classify according to the type of service initiated by the terminal or the access priority, there are two ways:
- the non-H2H terminal is classified according to the service type or access priority initiated by the terminal, and the backoff corresponding to each service type or access priority classification is placed in the RAR MAC PDU.
- All new versions of the terminal are classified according to the service type or access priority initiated by the terminal, that is, only the backoff of the original protocol version of the H2H terminal is placed in the backoff subheader, and the new version of the terminal (including the new version of the H2H terminal and The backoff corresponding to each service type or access priority class of the non-H2H terminal is placed after the last RAR of the RAR MAC PDU. That is, as shown in Figure 9.
- the access network element solves the random access preamble sent by the terminal, it may choose not to send, send a part, or send all the information of the random access backoff value set by the classification.
- Step 3 The terminal searches for a corresponding random access fallback value according to its own category to perform random access delay processing.
- the terminal after receiving the RAR MAC PDU, the terminal searches for the corresponding backoff value according to its own category, and performs random access delay processing according to the backoff value, including: a) after the terminal receives the RAR MAC PDU with backoff, according to the backoff The backoff value of the value is compared with the backoff value comparison table, and the backoff value of the terminal side is set to the detected backoff value. If the RAR MAC PDU received by the terminal does not include the backoff of the category to which the terminal belongs, the backoff of the terminal side is set to 0.
- the new version of the terminal may first search for a flag indicating "the information indicating the backoff value of the classification setting in the RAR MAC PDU", if the flag indicates "No", and the terminal If the terminal does not belong to the H2H terminal, the backoff of the terminal can be set to 0. If the terminal is an H2H terminal, the information about the corresponding backoff value can be found in the backoff subheader.
- the terminal calculates the delay time of the next random access according to the current backoff value of the terminal side and the predetermined rule, and calculates
- Ii if classified according to H2H and non-H2H (such as M2M), and the RAR MAC PDU received by the terminal has information about the backoff value of the H2H terminal, and the information of the backoff value of the non-H2H terminal, the H2H terminal is uniformly distributed.
- the principle randomly takes a value between 0 and H2H backoff values as the random access delay time.
- the non-H2H terminal randomly takes a value between H2H backoff and H2H backoff + M2M backoff as the random access delay time according to the principle of uniform distribution, or randomly takes a value between H2H backoff and M2M backoff according to the principle of uniform distribution.
- the M2M backoff is greater than H2H backoff at this time;
- the random access delay time of each level is in accordance with the principle of uniform distribution from 0 to the backoff of the current level + the previous level Randomly take a value between the backoffs; or, the random access delay time of each level randomly takes a value between the backoff of the previous stage and the backoff of the current level and the backoff of the previous stage according to the principle of uniform distribution; or The random access delay time of each level randomly takes a value between the backoff of the previous level and the backoff of the current level according to the principle of the uniform hook distribution.
- iV if classified according to the service type initiated by the terminal, according to the order of the service type from high to low, the random access delay time of each level is 0 to the backoff + the previous level according to the principle of uniform distribution.
- the expression is similar to iii.
- the embodiment of the invention further discloses a random access response medium access control protocol data unit (RAR MAC PDU) sent by the access network element to the terminal, where the RAR MAC PDU includes:
- the RAR MAC PDU includes the information of the random access fallback value set by the classification, where the information of the random access backoff value set by the classification is a plurality of randomized categories set by the access network element for each category of the terminal classification.
- the access value is accessed, so that the terminal searches for the corresponding random access backoff value in the RAR MAC PDU according to its own category to perform random access delay processing.
- the terminal classification manner is one or a combination of the following manners: according to whether the terminal is classified by an H2H terminal, and is classified into an H2H terminal and a non-H2H terminal; and classified according to a terminal group; Classification of service types initiated by the terminal, one terminal has one or more service types; classified according to the access priority of the terminal, one terminal has one or more access priorities; and classified according to the protocol version of the terminal.
- the information about the random access backoff value set by the classification includes a first flag, where the first flag is used to indicate whether there is information about a random access backoff value set by the classification in the RAR MAC PDU.
- the first flag is set in a reserved bit of the backoff subheader of the RAR MAC PDU, or is set after the last random access response in the RAR MAC PDU. Starting position.
- whether there is a random access backoff value set by the classification in the RAR MAC PDU is implicitly indicated by one of the following ways: The terminal and the network agreed that the RAR MAC PDU necessarily includes the random access fallback of the classification setting.
- the RAR MAC PDU includes a random access back-off value set by the classification; if there is no fallback sub-head in the RAR MAC PDU, the RAR The MAC PDU does not contain the random access fallback value set by the classification. In the above RAR MAC PDU, only the information of the random access backoff value corresponding to the category to which the terminal belongs is placed.
- the information of the random access backoff value set by the classification when the terminal is divided into an H2H terminal and a non-H2H terminal, the information of the random access backoff value set by the classification includes a category identifier, where the category identifier is used to indicate whether there is a random connection of the non-H2H terminal. Entering the information of the back-off value, the category identifier is set separately or combined with a first flag, and the first flag is used to indicate whether there is information about the random access back-off value set by the classification in the RAR MAC PDU.
- the information of the random access backoff value set by the classification includes information of one or more category identifiers and their corresponding random access backoff values.
- each category identifier includes a category identifier value and a second flag, where the second flag is used to indicate whether there is another category identifier behind the category identifier, and the random access back corresponding to each category identifier
- the information of the depreciation is arranged in the order of the category identification after all the category identifiers, or immediately after the corresponding category identifiers.
- the information about the random access backoff value set by the classification includes a third flag, where the third flag is used to indicate whether the random access backoff value of all categories of the terminal is included in the RAR MAC PDU.
- the information of the random access backoff value set by the classification further includes information of a random access backoff value of each category arranged in a predetermined order;
- the third flag indicates "No", and the information of the random access backoff value set by the classification further includes information of one or more category identifiers and their corresponding random access backoff values.
- the information of the random access backoff value is a sequence number of a random access backoff value, and each sequence number corresponds to a random access backoff value of one level, and the terminal is divided into an H2H terminal and a non-H2H terminal.
- the value range of the non-H2H terminal is greater than or equal to the value of the random access backoff value of the H2H terminal, and the number of the random access backoff value is greater than or equal to the random access backoff value of the H2H terminal. series.
- the terminal classification is based only on whether it is an H2H terminal or a terminal packet.
- the information of the random access backoff value corresponding to the H2H terminal is placed in the backoff subheader, and each of the non-H2H terminal or the non-H2H terminal.
- the information of the random access backoff value corresponding to the packet is placed after the last RAR of the RAR MAC PDU.
- the information about the random access backoff value set by the classification includes:
- the information of the random access backoff value set by the classification is set after the last RAR in the RAR MAC PDU.
- the terminal classification is classified according to the service type or access priority initiated by the terminal, and the information of the random access backoff value is set in one of the following manners:
- the non-H2H terminal is classified into the service type or the access priority of the terminal, and the information of the random access rollback value corresponding to the H2H terminal is placed in the backoff subheader.
- the information of the random access backoff value corresponding to the priority classification is placed after the last RAR of the RAR MAC PDU;
- the service type or access priority of the terminal is classified.
- the information of the random access rollback value of the original protocol version of the H2H terminal is placed in the backoff subheader.
- the information of the random access backoff value corresponding to the service type or the access priority class is placed after the last RAR of the RAR MAC PDU.
- the embodiment further discloses a random access control system, the system includes: a setting module, configured to: set multiple random access fallback values for each category classified by the terminal; and send a module, which is set to : Random Access Response Media Access Control Protocol sent to the terminal
- the data unit (RAR MAC PDU) includes information of a random access backoff value set by classification; and a searching module, and searching for a corresponding random access backoff value in the RAR MAC PDU according to the terminal's own category for random access Delayed processing.
- the information about the random access backoff value set by the sending module by the sending module includes a first flag, where the first flag is used to indicate whether there is a random access backoff value set by the classification in the RAR MAC PDU.
- the first flag is set in the reserved bit of the backoff subheader of the RAR MAC PDU or at the beginning of the last random access response in the RAR MAC PDU.
- the information about the random access backoff value set by the classification sent by the sending module includes a flag, a classification, for “indicating whether there is a random access backoff value of the classification setting in the RAR MAC PDU”.
- One or more of the category identifier and the information of the corresponding random access backoff value, and the information of the random access backoff value set by the classification is set after the last RAR in the RAR MAC PDU.
- the embodiment further discloses an access network element, where the access network element includes: a setting module, configured to: set multiple random access fallback values for each category classified by the terminal; and send a module, configured to: include, in a random access response medium access control protocol data unit (RAR MAC PDU) sent to the terminal, information of a random access backoff value set by classification, so that the terminal is based on the terminal itself Category, find the corresponding random access backoff value in the RAR MAC PDU for random access delay processing.
- the information about the random access fallback value set by the sending module in the access network element includes the first flag, where the first flag is used to indicate whether there is a random connection of the classification setting in the RAR MAC PDU. Entering the information of the back-off value, the first flag is set in the reserved bit of the back-off sub-header of the RAR MAC PDU, or is set at the beginning position after the last random access response in the RAR MAC PDU.
- the value information includes one or more of a flag for "indicating whether there is information of a random access fallback value set by the classification in the RAR MAC PDU", a classification category identifier, and information of a corresponding random access backoff value thereof.
- the item, the information of the random access backoff value set by the classification is set after the last RAR in the RAR MAC PDU.
- the present invention sets different backoff values for different terminal types, service types, and access priorities, so that random access of different types of terminals is reasonably distributed in the time domain, which can greatly reduce terminal access. Probability of conflict.
- the competition between random access resources of different types or different levels of terminals can be reduced, thereby reducing access congestion.
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Abstract
本发明公开了一种随机接入控制方法,所述方法包括:接入网网元针对终端分类的各个类别,分类设置多个随机接入回退值;接入网网元在向终端发送随机接入响应媒体接入控制协议数据单元(RARMACPDU),所述RARMACPDU包含分类设置的随机接入回退值的信息;以及终端根据自身类别,在RARMACPDU中查找对应的随机接入回退值进行随机接入延迟处理。本发明还公开了一种随机接入控制***。本发明可以大大降低终端的接入冲突概率。
Description
一种随机接入控制方法及***
技术领域 本发明涉及无线通信技术领域,特别涉及一种随机接入控制方法及***。
背景技术
人到人(Human to Human, H2H )通信是指人与人之间的通信, 是人通 过对设备的操作进行通信, 现有无线通信技术是基于 H2H 的通信发展起来 的。 而 M2M狭义上的定义是机器到机器的通信, 广义上的定义是以机器终 端智能交互为核心的、 网络化的应用与服务。 机器到机器 (Machine to Machine, M2M )是基于智能机器终端, 以多种通信方式为接入手段, 为客 户提供的信息化解决方案, 用于满足客户对监控、 指挥调度、 数据釆集和测 量等方面的信息化需求。 无线技术的发展是 M2M市场发展的重要因素, 它突破了传统通信方式 的时空限制和地域障碍, 使企业和公众摆脱了线缆束缚, 让客户更有效地控 制成本、 降低安装费用并且使用简单方便。 另外, 日益增长的需求推动着 M2M 不断向前发展, 与信息处理能力及网络带宽不断增长相矛盾的是, 信 息获取的手段远远落后, 而 M2M很好的满足了人们的这一需求, 通过它人 们可以实时监测外部环境, 实现大范围、 自动化的信息釆集。 因此, M2M可 以应用于行业应用、 家庭应用、 以及个人应用等。 行业应用如: 交通监控、 告警***、 海上救援、 自动售货机、 以及开车付费等。 家庭应用如: 自动抄 表、 以及温度控制等。 个人应用如: 生命检测和远端诊断等。 在现有技术中, 提出了将属于一个用户的多个 M2M移动终端分组操作 的需求,具体的,将上述的多个 M2M移动终端 (机器类型通讯(Machine Type Communication, MTC ) device, MD, 或 MTC Equipment, ME)组成一组, 网络可以对属于一个组的 M2M移动终端进行共同的计费、服务质量( Quality of Service, QoS )控制、 以及寻呼等操作。 考虑到一个群组内的 MD有着共 同的属性, 上述的基于群组的操作会大大节省网络的资源开销, 以及带来处
理的便利。 随机接入是无线通信***中终端的一个最基本功能, 它使终端与网络建 立连接成为可能。诚如其名,这样的接入的发起以及釆用的资源具有随机性, 当然接入成功也具有随机性。 随机接入有两种模式: 基于竟争模式和基于非 竟争模式。这两种模式的随机接入过程的流程是不同的,适用于不同的场景。 基于竟争模式的随机接入在下面的应用过程中适用: 无线资源控制空闲 ( Radio Resource Control IDLE , RRC IDLE )状态下的初始接入; 无线链路 出错以后的初始接入; 以及无线资源控制连接( RRC— CONNECTED )状态 下, 当有上行数据传输时。 基于非竟争模式的随机接入在下面的应用过程中适用 :
RRC— CONNECTED状态下, 当下行有数据传输时; 以及终端在切换过程中 的随机接入过程。 基于竟争模式的随机接入分为四个步骤: 步骤一、 用户终端(User Equipment, UE )发送随机接入前导; UE在发 起随机接入请求之前,从可用的随机接入发送机会中随机选择一个发送机会, 从可用的前导码集合中等概率的随机选择一个前导码并且将所选前导码发送 到基站(eNodeB, eNB ) 。 步骤二、 eNB向 UE反馈随机接入响应消息。 eNB若正确解出了前导码, 则依据前导码反馈一个对应的随机接入响应 (Random Access Response, RAR ) , 随机接入响应消息又可称为消息 2 ( msg2 ) 。 前导码不止一个, 因 此 eNB反馈的随机接入响应媒体接入控制协议数据单元 (RAR Media Access Control Protocol Data Unit, RAR MAC PDU)中包含多个前导码对应的 RAR。
RAR MAC PDU的构成如图 1所示。 RAR MAC PDU由 1个 MAC头 (header)和 0、 1或多个 MAC RAR,以及可选的( optional )填充内容( padding ) 构成。 其中 MAC header由 1个回退(backoff)子头 (subheader ) 、 0个、 1 个或多个 RAR subheader构成。 其中 backoff 子头中包含了 backoff值, 每一 个 RAR子头则对应着每一个 MAC RAR。 backoff值的作用是让随机接入失败的 UE不立刻发起第二次随机接入,
而是等待一段时间后,再发起第二次随机接入,这样可以降低接入碰撞概率, 减少接入拥塞。 步骤三、 终端反馈消息 3 ( msg3 ); UE收到和自己所发的前导码对应的 RAR后, 反馈消息 3 , 消息 3中包含 UE的身份识别码。 步骤四、 竟争解决; 由于在步骤一中, 可能发生多个 UE使用了同一个 前导码的情况, 在这种情况下, 这些 UE都会在步骤三将自己的身份识别码 发给 eNB,当 eNB收到的对应同一个前导码的 UE身份识别码超过一个, eNB 就会知道在这个前导码上发生了接入碰撞, 或者说接入竟争。 eNB可在这些 发生竟争的 UE 中选择一个, 将其识别信息包含在竟争解决消息中发回给 UE。 当发生竟争的 UE在竟争解决消息中没有发现自己的识别信息, 就会知 道自己这次随机接入竟争失败。
UE在发起随机接入之前的初始化过程中, 将 UE侧的 backoff值置 0。 如果 UE收到的 RAR MAC PDU中不包含 backoff 子头,则将 UE侧的 backoff 值置 0; 若 UE收到的 RAR MAC PDU中包含 backoff 子头, 那么根据该 backoff 子头中的 backoff值进行以下随机接入延时处理:
1, 将 UE侧的 backoff值设为 backoff 子头中包含的 backoff值;
2, 如果 UE没有收到和自己对应的 RAR, 则认为随机接入响应接收失 败, 如果本次随机接入是基于竟争模式的 (即由 UE的 MAC层自行选择前 导码) , 那么 UE将根据 backoff值延迟一段时间后, 再进行一次随机接入, 延迟时间的长度值的决定方法是: 根据均匀分布的原则在 0到 backoff值之 间取一个随机值, 该随机值即作为 UE延迟时间的长度值。
3 , 如果 UE竟争解决失败, 那么 UE将根据 backoff值延迟一段时间后, 再进行一次随机接入, 延迟时间的决定方法同上。
Backoff子头的结构如图 2所示, 其包括: "E" : 如果为 "Γ , 表示该子头后面还有其他子头; 如果为 "0" , 代表
该子头后面是 MAC RAR或者 padding;
"T" : 如果为 "Γ , 表示本子头是 backoff子头; 如果不为 "1" , , 表 示本子头是 RAR子头 (RAR子头中没有 "BI" 域, 而是有 "RAPID" 域, 其中放置该 RAR子头对应的前导码序号) ;
"R" : 保留比特位, 设置为 0, 老版本的 UE不会读这些保留比特位; 以及
"BI" : 共 4比特, 放置 backoff值的序号, 序号和实际的 backoff值之 间的对应关系如下表:
表 1
当网络中的终端数量变多, 大量终端同时发起随机接入请求接入到网络 时, 网络中的接入前导码资源可能发生不够用的情况, 导致大量 MTC终端
会发生接入冲突, 因此, 当 eNB检测到网络负荷变重时,会通过调整 backoff 值来在时间域上打散终端的随机接入行为, 降低接入冲突概率。 在现有的长期演进(Long Term Evolution, LTE ) 网络中, 当前规定的 backoff值的范围主要是针对 H2H (人与人)通信的终端来定义的, 当 M2M 应用大量普及, M2M终端数量会远远超过 H2H终端, 从而极有可能对网络 的接入资源造成过载, 导致接入冲突率大增。 本申请发明人发现: 现有的 backoff 值域虽然可以一定程度上使得终端的随机接入行为离散化, 但是在 M2M终端的绝对数量压力下 (一个小区内的 M2M终端数量可能在 H2H终 端数量的 10倍以上),仍然可能无法保证网络的接入冲突概率符合运营的服 务质量要求。 同时, 由于 M2M终端的业务类型种类远远多于 H2H终端, 各 种业务类型对随机接入的要求差别很大(有的对接入延迟的容忍度较大, 有 的较小) , 而且不同业务的接入优先级别也不同。 因此,对如此多种类的 M2M终端以及 H2H终端使用同一个 backoff值, 会造成不同类型的终端之间发生接入冲突的概率较高,对于 H2H终端以及高 优先级或者重要业务级别的 M2M终端, 其服务感受度会严重受到影响。
发明内容 本发明要解决的技术问题是需要提供一种随机接入控制方法及***, 一 种接入网网关以及一种 RAR MAC PDU , 可以降低终端的接入冲突概率。 为了解决上述技术问题, 本发明提供了一种随机接入控制方法, 所述方 法包括: 接入网网元针对终端分类的各个类别, 分类设置多个随机接入回退值; 接入网网元在向终端发送随机接入响应媒体接入控制协议数据单元 (RAR MAC PDU) , 所述 RAR MAC PDU包含分类设置的随机接入回退值的 信息; 以及 终端根据自身类别,在 RAR MAC PDU中查找对应的随机接入回退值进 行随机接入延迟处理。
上述方法中, 所述终端分类的方式为以下方式中的一种或组合: 按照终端是否是 H2H终端来分类, 分为 H2H终端和非 H2H终端; 按照终端分组 (group)来分类; 按照终端发起的业务类型来分类, 一个终端有一种或多种业务类型; 按照终端的接入优先级来分类, 一个终端有一个或多个接入优先级; 以 及 按照终端的协议版本来分类。 上述方法中, 所述分类设置的随机接入回退值的信息包括第一标志, 该 第一标志用于指示 RAR MAC PDU中是否存在分类设置的随机接入回退值 的信息。 上述方法中, 该第一标志设置在 RAR MAC PDU的回退子头的保留位, 或者设置在 RAR MAC PDU中的最后一个随机接入响应之后的开头位置。 上述方法中, RAR MAC PDU中是否存在分类设置的随机接入回退值通 过以下方式中的一种隐式地指示:
终端和网络约定 RAR MAC PDU必然包含分类设置的随机接入回退值; 以及 终端和网络约定, 若 RAR MAC PDU中有回退子头, 则该 RAR MAC PDU中包含分类设置的随机接入回退值; 若 RAR MAC PDU中没有回退子 头, 则该 RAR MAC PDU中不包含分类设置的随机接入回退值。 接入网网元在向终端发送 RAR MAC PDU的步骤之前, 所述方法还包 括:
接入网网元为不同的终端的分类分配专用的随机接入前导; 以及 接入网网元检测到终端发送的随机接入前导后,确定该终端所属的类别; 接入网网元在向终端发送 RAR MAC PDU的步骤中,接入网网元在向终 端发送的 RAR MAC PDU中,只放置该终端所属的类别对应的随机接入回退 值的信息。
上述方法中, 终端分为 H2H终端和非 H2H终端, 所述分类设置的随机 接入回退值的信息包括一类别标识, 所述类别标识用于表示是否存在非 H2H 终端的随机接入回退值的信息, 该类别标识单独设置或与一第一标志合并设 置,该第一标志用于指示 RAR MAC PDU中是否存在分类设置的随机接入回 退值的信息。 上述方法中, 所述分类设置的随机接入回退值的信息包括一个或多个类 别标识及其对应的随机接入回退值的信息。 上述方法中, 所述每一类别标识包括一类别标识值和一第二标志, 该第 二标志用于表示该类别标识后面是否还有其他类别标识, 各类别标识对应的 随机接入回退值的信息在所有类别标识之后按类别标识的顺序依次排列, 或 者紧跟在各自对应的类别标识之后。 上述方法中, 所述分类设置的随机接入回退值的信息包括一第三标志, 所述第三标志用于表示 RAR MAC PDU中是否包含了终端所有类别的随机 接入回退值的信息, 如该第三标志表示 "是" , 则所述分类设置的随机接入 回退值的信息还包括按约定的顺序排列的每一类别的随机接入回退值的信 息; 如该第三标志表示 "否" , 则所述分类设置的随机接入回退值的信息还 包括一个或多个类别标识及其对应的随机接入回退值的信息。 上述方法中, 所述随机接入回退值的信息为随机接入回退值的序号, 每 一序号对应一个级数的随机接入回退值,终端分为 H2H终端和非 H2H终端, 非 H2H终端的取值值域大于或等于 H2H终端的随机接入回退值的取值值域, 划分的随机接入回退值级数大于或等于 H2H终端的随机接入回退值的级数。 上述方法中, 终端分类时只按照是否是 H2H终端或者按照终端分组分 类, H2H终端对应的随机接入回退值的信息放在回退子头中, 非 H2H终端 或非 H2H 终端的各个分组对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后。 上述方法中, 所述分类设置的随机接入回退值的信息包括 "用于指示 RAR MAC PDU中是否存在分类设置的随机接入回退值的信息" 的标志、 分 类类别标识及其对应的随机接入回退值的信息中的一项或多项, 所述分类设
置的随机接入回退值的信息设置在 RAR MAC PDU中的最后一个 RAR之后。 接入网网元在向终端发送 RAR MAC PDU的步骤之前, 所述方法还包 括: 接入网网元解出终端的随机接入前导码后, 选择不发、 发送一部分或者 发送全部的分类设置的随机接入回退值的信息。 上述方法中, 终端分类时按照终端发起的业务类型或者接入优先级来分 类, 随机接入回退值的信息按以下方式中的一种设置:
(1)仅对非 H2H终端按终端发起的业务类型或者接入优先级进行分类, H2H终端对应的随机接入回退值的信息放在 backoff子头中, 非 H2H终端的 各个业务类型或者接入优先级分类对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后; 以及
(2)对所有新版本终端均按终端发起的业务类型或者接入优先级进行分 类, 原协议版本的 H2H终端的随机接入回退值的信息放在 backoff子头中, 新版本终端的各个业务类型或者接入优先级分类对应的随机接入回退值的信 息放在 RAR MAC PDU的最后一个 RAR之后。 上述方法中, 终端根据自身类别, 在 RAR MAC PDU中查找对应的随机 接入回退值进行随机接入延迟处理的步骤包括: 终端根据与自身类别对应的随机接入回退值的信息查找到对应的随机接 入回退值, 将终端侧的随机接入回退值设为查出的该随机接入回退值; 以及 当终端接收 RAR失败或者竟争接入时竟争失败, 且没有达到前导码最 大发射次数, 终端根据终端侧当前的随机接入回退值和预定的规则计算出下 一次随机接入的延迟时间。 上述方法中, 终端根据终端侧当前的随机接入回退值和预定的规则计算 出下一次随机接入的延迟时间的步骤包括: 计算该随机接入延迟时间时, 按照均匀分布的原则在 0到随机接入回退 值之间随机取一个值; 或者 终端按照 H2H和非 H2H来分类, 计算该随机接入延迟时间时, 如终端
收到的 RAR MAC PDU中既有 H2H终端的随机接入回退值 backoff!的信息 , 也有非 H2H终端的随机接入回退值 backofG的信息, 则 H2H终端按照均匀 分布的原则在 0 到 backoff! 之间随机取一个值作为随机接入延迟时间; 非 H2H终端则按照均匀分布的原则在 backoff!到 backoff 1+ backoff2, 或者在 backoff!到 backofG之间随机取一个值作为随机接入延迟时间,此时 backofG 大于 backoff! ; 或者 终端按照接入优先级或发起的业务类型来分类, 按照优先级或业务类型 等级由高到低的顺序设置随机接入回退值, 每一级的随机接入延迟时间按照 均匀分布的原则在 0 到本级的随机接入回退值 + 前一级的随机接入回退值 之间随机取一个值; 或者, 每一级的随机接入延迟时间按照均勾分布的原则 在前一级的随机接入回退值到本级的随机接入回退值 + 前一级的随机接入 回退值之间随机取一个值; 或者, 每一级的随机接入延迟时间按照均勾分布 的原则在前一级的随机接入回退值到本级的随机接入回退值之间随机取一个 值。 为了解决上述问题, 本发明还提供了一种随机接入控制***, 所述*** 包括: 设置模块, 其设置为: 针对终端分类的各个类别, 分类设置多个随机接 入回退值; 发送模块, 其设置为: 在向终端发送的随机接入响应媒体接入控制协议 数据单元 (RAR MAC PDU)中包含分类设置的随机接入回退值的信息; 以及 查找模块, 以及根据终端的自身类别, 在 RAR MAC PDU中查找对应的 随机接入回退值进行随机接入延迟处理。 上述***中, 所述发送模块发送的所述分类设置的随机接入回退值的信 息包括第一标志,该第一标志用于指示 RAR MAC PDU中是否存在分类设置 的随机接入回退值的信息,该第一标志设置在 RAR MAC PDU的回退子头的 保留位,或者设置在 RAR MAC PDU中的最后一个随机接入响应之后的开头 位置。 上述***中, 所述发送模块发送的所述分类设置的随机接入回退值的信
息包括 用于 "指示 RAR MAC PDU中是否存在分类设置的随机接入回退值 的信息" 的标志、 分类类别标识及其对应的随机接入回退值的信息中的一项 或多项,分类设置的随机接入回退值的信息设置在 RAR MAC PDU中的最后 一个 RAR之后。 为了解决上述问题, 本发明还提供了一种接入网网元向终端发送的随机 接入响应媒体接入控制协议数据单元 (RAR MAC PDU),所述 RAR MAC PDU 包括:
RAR MAC PDU包含分类设置的随机接入回退值的信息; 其中, 分类设 置的随机接入回退值的信息为所述接入网网元针对终端分类的各个类别, 分 类设置的多个随机接入回退值, 以使终端根据自身类别, 在 RAR MAC PDU 中查找对应的随机接入回退值进行随机接入延迟处理。 上述 RAR MAC PDU中,所述终端分类的方式为以下方式中的一种或组 合: 按照终端是否是 H2H终端来分类, 分为 H2H终端和非 H2H终端; 按照终端分组 (group)来分类; 按照终端发起的业务类型来分类, 一个终端有一种或多种业务类型; 按照终端的接入优先级来分类, 一个终端有一个或多个接入优先级; 以 及 按照终端的协议版本来分类。 上述 RAR MAC PDU中,所述分类设置的随机接入回退值的信息包括第 一标志,该第一标志用于指示 RAR MAC PDU中是否存在分类设置的随机接 入回退值的信息。 上述 RAR MAC PDU中, 该第一标志设置在 RAR MAC PDU的回退子 头的保留位,或者设置在 RAR MAC PDU中的最后一个随机接入响应之后的 开头位置。 上述 RAR MAC PDU中, RAR MAC PDU中是否存在分类设置的随机接 入回退值通过以下方式中的一种隐式地指示:
终端和网络约定 RAR MAC PDU必然包含分类设置的随机接入回退值; 以及 终端和网络约定, 若 RAR MAC PDU中有回退子头, 则该 RAR MAC PDU中包含分类设置的随机接入回退值; 若 RAR MAC PDU中没有回退子 头, 则该 RAR MAC PDU中不包含分类设置的随机接入回退值。 上述 RAR MAC PDU中,只放置该终端所属的类别对应的随机接入回退 值的信息。 上述 RAR MAC PDU中, 当终端分为 H2H终端和非 H2H终端, 所述分 类设置的随机接入回退值的信息包括一类别标识, 所述类别标识用于表示是 否存在非 H2H终端的随机接入回退值的信息,该类别标识单独设置或与一第 一标志合并设置,该第一标志用于指示 RAR MAC PDU中是否存在分类设置 的随机接入回退值的信息。 上述 RAR MAC PDU中,所述分类设置的随机接入回退值的信息包括一 个或多个类别标识及其对应的随机接入回退值的信息。 上述 RAR MAC PDU中,所述每一类别标识包括一类别标识值和一第二 标志, 该第二标志用于表示该类别标识后面是否还有其他类别标识, 各类别 标识对应的随机接入回退值的信息在所有类别标识之后按类别标识的顺序依 次排列, 或者紧跟在各自对应的类别标识之后。 上述 RAR MAC PDU中,所述分类设置的随机接入回退值的信息包括一 第三标志,所述第三标志用于表示 RAR MAC PDU中是否包含了终端所有类 别的随机接入回退值的信息, 如该第三标志表示 "是" , 则所述分类设置的 随机接入回退值的信息还包括按约定的顺序排列的每一类别的随机接入回退 值的信息; 如该第三标志表示 "否" , 则所述分类设置的随机接入回退值的 信息还包括一个或多个类别标识及其对应的随机接入回退值的信息。 上述 RAR MAC PDU中,所述随机接入回退值的信息为随机接入回退值 的序号,每一序号对应一个级数的随机接入回退值,终端分为 H2H终端和非 H2H终端, 非 H2H终端的取值值域大于或等于 H2H终端的随机接入回退值 的取值值域,划分的随机接入回退值级数大于或等于 H2H终端的随机接入回
退值的级数。 上述 RAR MAC PDU中, 终端分类时只按照是否是 Η2Η终端或者按照 终端分组分类, Η2Η终端对应的随机接入回退值的信息放在回退子头中, 非 Η2Η终端或非 Η2Η终端的各个分组对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后。 上述 RAR MAC PDU中, 所述分类设置的随机接入回退值的信息包括 "用于指示 RAR MAC PDU中是否存在分类设置的随机接入回退值的信息" 的标志、 分类类别标识及其对应的随机接入回退值的信息中的一项或多项, 所述分类设置的随机接入回退值的信息设置在 RAR MAC PDU中的最后一 个 RAR之后。 上述 RAR MAC PDU中,终端分类时按照终端发起的业务类型或者接入 优先级来分类, 随机接入回退值的信息按以下方式中的一种设置:
(1)仅对非 H2H终端按终端发起的业务类型或者接入优先级进行分类, H2H终端对应的随机接入回退值的信息放在 backoff子头中, 非 H2H终端的 各个业务类型或者接入优先级分类对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后; 以及
(2)对所有新版本终端均按终端发起的业务类型或者接入优先级进行分 类, 原协议版本的 H2H终端的随机接入回退值的信息放在 backoff子头中, 新版本终端的各个业务类型或者接入优先级分类对应的随机接入回退值的信 息放在 RAR MAC PDU的最后一个 RAR之后。 为了解决上述问题, 本发明还提供了一种接入网网元, 所述接入网网元 包括: 设置模块, 其设置为: 针对终端分类的各个类别, 分类设置多个随机接 入回退值; 以及 发送模块, 其设置为: 在向终端发送的随机接入响应媒体接入控制协议 数据单元 (RAR MAC PDU)中包含分类设置的随机接入回退值的信息,以使所 述终端根据终端的自身类别,在 RAR MAC PDU中查找对应的随机接入回退 值进行随机接入延迟处理。
上述接入网网元中, 所述发送模块发送的所述分类设置的随机接入回退 值的信息包括第一标志,该第一标志用于指示 RAR MAC PDU中是否存在分 类设置的随机接入回退值的信息,该第一标志设置在 RAR MAC PDU的回退 子头的保留位,或者设置在 RAR MAC PDU中的最后一个随机接入响应之后 的开头位置。
上述接入网网元中, 所述发送模块发送的所述分类设置的随机接入回退 值的信息包括 用于 "指示 RAR MAC PDU中是否存在分类设置的随机接入 回退值的信息" 的标志、 分类类别标识及其对应的随机接入回退值的信息中 的一项或多项,分类设置的随机接入回退值的信息设置在 RAR MAC PDU中 的最后一个 RAR之后。
本发明针对不同终端类型、 业务类型、 以及接入优先级设置不同的 backoff 值, 从而在时间域上使得不同类型的终端的随机接入得到合理的分 布, 可以大大降低终端的接入冲突概率。 此外还可以降低不同类型或者不同 级别的终端之间对随机接入资源的竟争, 从而减轻接入拥塞。
附图概述 图 1为现有技术的 RAR MAC PDU的构成图; 图 2为现有技术的 Backoff子头的结构图; 图 3为本发明实施例的 RAR MAC PDU的构成图; 的二种方式的示意图; 图 5为本发明实施例在 RAR MAC PDU的最后一个 RAR之后设置标志 的示意图;
图 6为本发明实施例按照终端是否是 H2H终端类分类的 RAR MAC PDU 的构成图; 图 7为本发明实施例按照终端分组分类的 RAR MAC PDU的构成图;
图 8为本发明实施例按照终端发起的业务类型或者接入优先级的不同来 分类的 RAR MAC PDU的一种构成图; 图 9为本发明实施例按照终端发起的业务类型或者接入优先级的不同来 分类的 RAR MAC PDU的另一种构成图; 图 10为本发明实施例的随机接入控制方法的流程图。
本发明的较佳实施方式 为使本发明的目的、 技术方案和优点更加清楚明白, 下文中将结合附图 对本发明的实施例进行详细说明。 需要说明的是, 在不冲突的情况下, 本申 请中的实施例及实施例中的特征可以相互任意组合。 本实施例描述了本发明的随机接入控制技术在 LTE***中的实施范例。 设实施例场景为 LTE*** , 接入网网元是 eNB。 本实施例的随机接入控制方法如图 10所示, 该方法包括: 步骤一, 接入网网元针对终端分类的各个类别, 设置多个随机接入回退 值(以下称为 backoff值) , 每一随机接入回退值对应一个或多个类别; 终端分类的方式可以是但不限于以下方式中的一种或组合:
• 按照终端分组来分类, 属于不同分组的终端属于不同的类别, 如下表
• 按照终端发起的业务类型来分类, 如下表所示: 业务类型 1 ( service class/type 1 ) 业务类型 1的 Backoff 业务类型 2 业务类型 2的 Backoff 业务类型 N 业务类型 N的 Backoff 由于一个终端可以发起一种或多种业务类型, 因此终端需依据自己发起 随机接入时要求建立的业务类型来选择 eNB下发的 backoff值, 也即意味着 一个终端可能适用多种 backoff值。
• 按照终端的接入优先级来分类, 如下表所示:
接入优先级由网络侧和终端约定, 可以根据呼叫类型或者业务类型来确 定接入优先级, 一个呼叫类型或者业务类型可对应一个接入优先级, 也可多 个呼叫类型或者业务类型对应一个接入优先级, 例如: 紧急呼叫类型对应高 接入优先级, 主叫数据业务类型对应低优先级, 在引入 M2M业务后, 可能 有更多业务类型, 其中某些业务类型的接入优先级可能和主叫数据业务类型 一样;
• 按照终端的协议版本来分类, 如分为原协议版本的终端和新协议版本 的终端。 以上分类方式可以组合, 如先分成 H2H终端和非 H2H终端两大类, 对 非 H2H终端再按照终端分组或终端发起的业务类型或终端的接入优先级分 成多个小类, 对 H2H终端可以不再划分。 在确定各个类别的 backoff 值时, 可根据分类原则以及网络负荷情况综
合考虑。 例如: 对于高接入优先级的终端, 其 backoff 可以配置较小; 或者 对于接入延迟容忍度较大的业务类型, 其 backoff 可配置的较大; 或者, 当 接入负荷或者业务数据负荷越大时, backoff值应设置的越大, 以减小新接入 的终端的数量, 避免负荷进一步增高。 对于同一类别, 也可以根据接入负荷 或者业务数据负荷来调整其对应的 backoff值。
步骤二, 接入网网元向终端发送分类设置的 backoff值的信息; 本实施例中, 分类设置的 backoff 值的信息包含在向终端发送的 RAR MAC PDU中。 接入网网元可以选择发一部分或者全部类别的 backoff值的信息, 例如: 当网络负荷较轻的时候, eNB可不为 H2H终端或者高接入优先级的终端设 置 backoff (即 backoff为 0 ) , 仅为 M2M终端或者低接入优先级的终端设置 backoff, 此时, eNB就无需发送 H2H终端或者高接入优先级的 backoff, 以 节省信令开销。 又如, 接入网网元可为不同的终端的分类分配专用的随机接 入前导, 例如: 指定一个或多个随机接入前导为 H2H终端专用, 另外一个或 多个随机接入前导为 M2M终端专用; 或者指定一个或多个随机接入前导为 某一业务类型专用, 以此类推…。 当接入网网元检测到终端发送的随机接入 前导后, 就能知道是哪一类的终端发起了随机接入, 从而在 RAR MAC PDU 中只放置该终端所属类别对应的 backoff值的信息。 考虑到后向兼容性, 为了避免现有版本的终端误读新的 backoff 值, 可 釆用图 3的方法,在 RAR MAC PDU的最后一个 RAR之后,设置新的 backoff 信息单元来容纳所述分类设置的 backoff 值的信息, 其中包括下述信息的一 项或者多项:
• 指示 RAR MAC PDU中是否存在分类设置的 backoff值的信息的标志; · 终端分类的类别标识;
• 类别对应的 backoff值的信息; 其中, 用于 "指示 RAR MAC PDU中是否存在分类设置的 backoff值的
信息 " 的标志放在 RAR MAC PDU中的最后一个 RAR之后的开头位置, 终 端可根据该标志判断是否需要读取后续的内容, 即类别标识以及分类设置的 backoff值的信息。 在另一实施例中, 上述用于 "指示 RAR MAC PDU中是否存在分类设置 的 backoff值的信息" 的标志也可以设置在图 1的 backoff子头中。
RAR MAC PDU中是否存在分类设置的 backoff值的信息可以通过显式 或者隐式的方式指示:
显式指示方法包括但不限于:在 RAR MAC PDU中设置一个标志( Flag ), 该标志用于指示 RAR MAC PDU中是否存在分类设置的 backoff值的信息。 如,可以在 RAR MAC PDU中的最后一个 RAR之后的开头位置设置该标志, 如图 5所示: 其中 "new backoff" 代表分类设置的 backoff值, 其中的 "E" 表示当前的 RAR MAC PDU中是否存在分类设置的 backoff值, 例如: "E" 为 0表示当前的 RAR MAC PDU中不存在分类设置的 backoff值; 反之则存 在分类设置的 backoff值。 标志的长度可以是 1位或多位。 在另一实施例中, 也可以在 RAR MAC PDU的 backoff 子头 (文中的 backoff子头指现有技术的 backoff子头, 参照图 1 )的保留位中设置该标志, 如图 4A和图 4B所示, 标志的长度可以是 1位或 2位, 其定义可以是: Flag 为 0: 表示当前的 RAR MAC PDU中不存在分类设置的 backoff值; Flag非 0: 表示当前的 RAR MAC PDU中存在分类设置的 backoff值; 上述定义是例子 之一, 当然也可以有其他定义方式, 不影响本发明的实质内容。 但上述标志不是必须的, 可以釆用隐式的方式来指示当前的 RAR MAC PDU中是否存在分类设置的 backoff值的信息,隐式的规则可以是如下之一:
• 终端和网络约定, RAR MAC PDU中必然包含分类设置的 backoff值 的信息;
• 终端和网络约定,若 RAR MAC PDU中有 backoff子头,则 RAR MAC PDU 中也包含分类设置的 backoff 值的信息; 若 RAR MAC PDU 中没有 backoff子头, 则 RAR MAC PDU中不包含分类设置的 backoff值的信息。
RAR MAC PDU中的分类设置的 backoff值的信息可以通过类别标识及 其对应的 backoff值的信息来表示。类别标识和前述的用于 "指示 RAR MAC PDU中是否存在分类设置的 backoff值的信息" 的标志可以分别设置在 RAR MAC PDU中, 也可以合并设置在 RAR MAC PDU中。 所述的合并设置在 RAR MAC PDU中是指设置一个标志, 该标志既可以表示类别标识的信息, 也可以表示 "RAR MAC PDU中是否存在分类设置的 backoff值的信息" 的 信息。
• 若只按照终端是否是 H2H终端分类: 可以不需要专门的分类类别的标识, 因为只有 2类: H2H终端和非 H2H 终端, H2H终端的 backoff值的信息按原方式设置在 backoff子头中。 前述的 用于 "指示 RAR MAC PDU中是否存在分类设置的 backoff值的信息" 的标 志已经足够可以包含这种分类信息。 如可以按下面方法表示: 参照图 4A和图 4B, 在 RAR MAC PDU的 backoff子头的保留位加入 flag , 其中 flag为 0表示当前的 RAR MAC PDU 中不存在非 H2H终端 backoff; 反之 flag为非 0则表示存在非 H2H终端 backoff 其中的 T为 1表示有 H2H终端的 backoff值的信息, T为 0表示无 H2H终端的 backoff值的信息。 图 4B与图 4A差别在于所占的保留位不同。
• 若只按照终端分组、 或者按照业务类型的不同来分类, 或者按照终端 不同的接入优先级别来分类: 参照图 5, RAR MAC PDU中包含各类终端的专门的类别标识。 其中的 分类标识可代表分组标识、 业务类型标识或者接入优先级别标识。 其次, 每 个类别标识中除类别标识值外还包含一个标志, 该标志用于表示该类别标识 后面是否还有其他类别标识; 如图 5所示, 若该标志表示 "是" 如 1 , 则表 示该类别标识后面还有 1个或多个其他类别标识; 若该标志为表示 "否" 的 值如 0, 则表示该类别标识后面是第一个类别标识对应的 backoff值的信息。 各类别标识对应的 backoff值按类别标识的顺序在各类别标识之后依次排列。 当然, 类别标识对应的 backoff值也可以紧跟在该类别标识之后。
分类类别标识和前述的用于 "指示 RAR MAC PDU中是否存在分类的 backoff 的标志可以分别设置在 RAR MAC PDU中,也可以合并设置在 RAR MAC PDU中。 即用一个标志同时表示分类类别的信息和 "RAR MAC PDU 中是否存在分类的 backoff值" 的信息。 · 可选地,设置一个标志用于表示 RAR MAC PDU中是否包含了所有类 别的 backoff值的信息: 如果该标志表示 "是" , 则当前 RAR MAC PDU中 无需包含类别标识, 以节省信令开销, 此时每一类别的 backoff 值的信息可 以在该标志后按约定的顺序依次排列; 如果否, 则 RAR MAC PDU中需要在 该标志后包含类别标识。 相应地, 终端根据该标志可以确定 RAR MAC PDU 中是否包含了所有类别的 backoff 值的信息, 如是, 按约定的顺序可以获知 各类别的 backoff值的信息,如否,则根据其中的类别标识找到对应的 backoff 值的信息。
不同类别的 backoff值的信息的表示方法是: · 将 backoff值划分为多个级数,分别对应不同的 backoff序号,在 RAR
MAC PDU中的 backoff值的信息为 backoff值的序号。终端收到 backoff序号 后根据 backoff值与 backoff值的序号的对应关系查找到对应的 backoff值。 由于非 H2H终端的业务类型很多, 因此其 backoff值的取值值域可大于或等 于 H2H终端的 backoff的取值值域, 其划分的 backoff级数也可大于或等于 H2H终端的 backoff的级数。 例如: backoff值划分的级数可以设置为下表:
表 2
7 240
8 320
9 480
10 720
11 960
12 1440
13 1920
14 2880
15 4800
表 2的 backoff 时间跨度范围比现有技术的更大, 可以使得终端在选择 随机接入延迟时的选择范围更大, 降低了不同类终端相互之间发生接入冲突 的概率。 表 2的取值仅为例子之一, 还可以有其他取值定义, 只要按照本发 明的原则设计 backoff取值即可。
• 接入网网元在确定要发送哪些类的 backoff值后, 将这些 backoff值 的序号填入 RAR MAC PDU中。 若按照终端是否是 H2H终端分类,那么 H2H终端对应的 backoff值的信 息可放在 backoff子头中, 非 H2H终端 (例如 M2M终端)对应的 backoff 值的信息放在 RAR MAC PDU的最后一个 RAR之后。 若按照终端分组分类, 则 H2H 终端对应的 backoff 值的信息可放在 backoff子头中,非 H2H终端(例如 M2M终端)的各个分组对应的 backoff 放 在 RAR MAC PDU的最后一个 RAR之后, 如图 7所示。 若按照终端发起的业务类型或者接入优先级的不同来分类, 那么有 2种 方式:
(1)仅对非 H2H终端按终端发起的业务类型或者接入优先级进行分类, 的各个业务类型或者接入优先级分类对应的 backoff 放在 RAR MAC PDU的
20
最后一个 RAR之后。 如图 8所示。
(2)对所有新版本终端均按终端发起的业务类型或者接入优先级进行分 类, 即仅原协议版本的 H2H终端的 backoff放在 backoff子头中, 新版本终 端 (包括新版的 H2H终端和非 H2H终端) 的各个业务类型或者接入优先级 分类对应的 backoff 放在 RAR MAC PDU的最后一个 RAR之后。 即如图 9 所示。 接入网网元解出终端发送的随机接入前导码后, 可以选择不发、 发送一 部分或者发送全部的分类设置的随机接入回退值的信息。
步骤三, 终端根据自身类别, 查找对应的随机接入回退值进行随机接入 延迟处理。 本实施例中, 终端收到 RAR MAC PDU后, 根据自身类别查找对应的 backoff值, 根据该 backoff值进行随机接入延迟处理包括: a) 终端收到带 backoff的 RAR MAC PDU后, 根据其中 backoff值的序 号与 backoff值的对照表查出对应的 backoff值, 将终端侧的 backoff值设为 查出的该 backoff值。 如果终端收到的 RAR MAC PDU中不包含自己所属类别的 backoff , 则 将终端侧的 backoff置 0。如,新版本的终端收到带 backoff的 RAR MAC PDU 后, 可以先查找 "指示 RAR MAC PDU中是否存在分类设置的 backoff值的 信息" 的标志, 如果该标志指示为 "否" , 且该终端不属于 H2H终端时, 则 可将终端侧的 backoff置 0 , 如该终端为 H2H终端, 可以到 backoff子头中查 找相应的 backoff值的信息。 b) 当终端接收 RAR失败或者竟争接入时竟争失败, 且没有达到前导码 最大发射次数, 终端根据终端侧当前的 backoff 值和预定的规则计算出下一 次随机接入的延迟时间, 计算方法有多种, 例如可以是下述方法之一: i, 随机接入延迟时间按照均匀分布的原则在 0到 backoff值之间随机取 一个值, 即随机接入延迟时间 = uniform— distribution— rand(0,backoff);
ii, 如果按照 H2H和非 H2H(如 M2M )来分类,且终端收到的 RAR MAC PDU中既有 H2H终端的 backoff值的信息,也有非 H2H终端的 backoff值的 信息, H2H终端按照均匀分布的原则在 0到 H2H backoff值之间随机取一个 值作为随机接入延迟时间。 非 H2H 终端则按照均匀分布的原则在 H2H backoff到 H2H backoff + M2M backoff之间随机取一个值作为随机接入延迟 时间, 或者, 按照均匀分布的原则在 H2H backoff到 M2M backoff之间随机 取一个值作为随机接入延迟时间 , 此时 M2M backoff大于 H2H backoff; 表示为:
H2H 终端的随机接入延迟时间 = uniform— distribution— rand< 0, H2H backoff), 非 H2H 终端的随机接入延迟时间 = uniform— distribution— rand(H2H backoff, H2H backoff + M2M backoff); 或者, uniform— distribution— rand(H2H backoff, M2M backoff) , ( M2M backoff大于 H2H backoff)。 iii, 如果按照终端的接入优先级来分类, 则按照优先级由高到低的顺序, 每一级的随机接入延迟时间按照均匀分布的原则在 0到本级的 backoff + 前 一级的 backoff 之间随机取一个值; 或者, 每一级的随机接入延迟时间按照 均匀分布的原则在前一级的 backoff到本级的 backoff + 前一级的 backoff 之 间随机取一个值; 或者, 每一级的随机接入延迟时间按照均勾分布的原则在 前一级的 backoff 到本级的 backoff 之间随机取一个值, 此时要求本级的 backoff大于前一级的 backoff; 表示为: 每一级的随机接入延迟时间 = uniform— distribution— rand(0 , 本级 backoff + 前一级 backoff); 或者, 每一级的随机接入延迟时间 = uniform— distribution— rand (前一级 backoff, 本级 backoff + 前一级 backoff); 或者, 每一级的随机接入延迟时间 = uniform— distribution— rand (前一级 backoff, 本级 backoff)。
iV, 如果按照终端发起的业务类型来分类, 则按照业务类型的等级由高 到低的顺序, 每一级的随机接入延迟时间按照均匀分布的原则在 0到本级的 backoff + 前一级的 backoff 之间随机取一个值; 或者, 每一级的随机接入延 迟时间按照均匀分布的原则在前一级的 backoff到本级的 backoff + 前一级的 backoff 之间随机取一个值; 或者, 每一级的随机接入延迟时间按照均匀分 布的原则在前一级的 backoff到本级的 backoff之间随机取一个值。 表达式与 iii类似。
本发明实施例还公开了一种接入网网元向终端发送的随机接入响应媒体 接入控制协议数据单元 (RAR MAC PDU) , 所述 RAR MAC PDU包括:
RAR MAC PDU包含分类设置的随机接入回退值的信息; 其中, 分类设 置的随机接入回退值的信息为所述接入网网元针对终端分类的各个类别, 分 类设置的多个随机接入回退值, 以使终端根据自身类别, 在 RAR MAC PDU 中查找对应的随机接入回退值进行随机接入延迟处理。 上述 RAR MAC PDU中,所述终端分类的方式为以下方式中的一种或组 合: 按照终端是否是 H2H终端来分类, 分为 H2H终端和非 H2H终端; 按照终端分组 (group)来分类; 按照终端发起的业务类型来分类, 一个终端有一种或多种业务类型; 按照终端的接入优先级来分类, 一个终端有一个或多个接入优先级; 以 及 按照终端的协议版本来分类。 上述 RAR MAC PDU中,所述分类设置的随机接入回退值的信息包括第 一标志,该第一标志用于指示 RAR MAC PDU中是否存在分类设置的随机接 入回退值的信息。 上述 RAR MAC PDU中, 该第一标志设置在 RAR MAC PDU的回退子 头的保留位,或者设置在 RAR MAC PDU中的最后一个随机接入响应之后的
开头位置。 上述 RAR MAC PDU中 , RAR MAC PDU中是否存在分类设置的随机接 入回退值通过以下方式中的一种隐式地指示: 终端和网络约定 RAR MAC PDU必然包含分类设置的随机接入回退值; 以及 终端和网络约定, 若 RAR MAC PDU中有回退子头, 则该 RAR MAC PDU中包含分类设置的随机接入回退值; 若 RAR MAC PDU中没有回退子 头, 则该 RAR MAC PDU中不包含分类设置的随机接入回退值。 上述 RAR MAC PDU中,只放置该终端所属的类别对应的随机接入回退 值的信息。 上述 RAR MAC PDU中, 当终端分为 H2H终端和非 H2H终端, 所述分 类设置的随机接入回退值的信息包括一类别标识, 所述类别标识用于表示是 否存在非 H2H终端的随机接入回退值的信息,该类别标识单独设置或与一第 一标志合并设置,该第一标志用于指示 RAR MAC PDU中是否存在分类设置 的随机接入回退值的信息。 上述 RAR MAC PDU中,所述分类设置的随机接入回退值的信息包括一 个或多个类别标识及其对应的随机接入回退值的信息。 上述 RAR MAC PDU中,所述每一类别标识包括一类别标识值和一第二 标志, 该第二标志用于表示该类别标识后面是否还有其他类别标识, 各类别 标识对应的随机接入回退值的信息在所有类别标识之后按类别标识的顺序依 次排列, 或者紧跟在各自对应的类别标识之后。 上述 RAR MAC PDU中,所述分类设置的随机接入回退值的信息包括一 第三标志,所述第三标志用于表示 RAR MAC PDU中是否包含了终端所有类 别的随机接入回退值的信息, 如该第三标志表示 "是" , 则所述分类设置的 随机接入回退值的信息还包括按约定的顺序排列的每一类别的随机接入回退 值的信息; 如该第三标志表示 "否" , 则所述分类设置的随机接入回退值的 信息还包括一个或多个类别标识及其对应的随机接入回退值的信息。
上述 RAR MAC PDU中 ,所述随机接入回退值的信息为随机接入回退值 的序号,每一序号对应一个级数的随机接入回退值,终端分为 H2H终端和非 H2H终端, 非 H2H终端的取值值域大于或等于 H2H终端的随机接入回退值 的取值值域,划分的随机接入回退值级数大于或等于 H2H终端的随机接入回 退值的级数。 上述 RAR MAC PDU中, 终端分类时只按照是否是 H2H终端或者按照 终端分组分类, H2H终端对应的随机接入回退值的信息放在回退子头中, 非 H2H终端或非 H2H终端的各个分组对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后。 上述 RAR MAC PDU中, 所述分类设置的随机接入回退值的信息包括
"用于指示 RAR MAC PDU中是否存在分类设置的随机接入回退值的信息" 的标志、 分类类别标识及其对应的随机接入回退值的信息中的一项或多项, 所述分类设置的随机接入回退值的信息设置在 RAR MAC PDU中的最后一 个 RAR之后。 上述 RAR MAC PDU中,终端分类时按照终端发起的业务类型或者接入 优先级来分类, 随机接入回退值的信息按以下方式中的一种设置:
(1)仅对非 H2H终端按终端发起的业务类型或者接入优先级进行分类, H2H终端对应的随机接入回退值的信息放在 backoff子头中, 非 H2H终端的 各个业务类型或者接入优先级分类对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后; 以及
(2)对所有新版本终端均按终端发起的业务类型或者接入优先级进行分 类, 原协议版本的 H2H终端的随机接入回退值的信息放在 backoff子头中, 新版本终端的各个业务类型或者接入优先级分类对应的随机接入回退值的信 息放在 RAR MAC PDU的最后一个 RAR之后。 本实施例还公开了一种随机接入控制***, 所述***包括: 设置模块, 其设置为: 针对终端分类的各个类别, 分类设置多个随机接 入回退值; 发送模块, 其设置为: 在向终端发送的随机接入响应媒体接入控制协议
数据单元 (RAR MAC PDU)中包含分类设置的随机接入回退值的信息; 以及 查找模块, 以及根据终端的自身类别, 在 RAR MAC PDU中查找对应的 随机接入回退值进行随机接入延迟处理。 上述***中, 所述发送模块发送的所述分类设置的随机接入回退值的信 息包括第一标志,该第一标志用于指示 RAR MAC PDU中是否存在分类设置 的随机接入回退值的信息,该第一标志设置在 RAR MAC PDU的回退子头的 保留位,或者设置在 RAR MAC PDU中的最后一个随机接入响应之后的开头 位置。 上述***中, 所述发送模块发送的所述分类设置的随机接入回退值的信 息包括 用于 "指示 RAR MAC PDU中是否存在分类设置的随机接入回退值 的信息" 的标志、 分类类别标识及其对应的随机接入回退值的信息中的一项 或多项,分类设置的随机接入回退值的信息设置在 RAR MAC PDU中的最后 一个 RAR之后。
本实施例还公开了一种接入网网元, 所述接入网网元包括: 设置模块, 其设置为: 针对终端分类的各个类别, 分类设置多个随机接 入回退值; 以及 发送模块, 其设置为: 在向终端发送的随机接入响应媒体接入控制协议 数据单元 (RAR MAC PDU)中包含分类设置的随机接入回退值的信息,以使所 述终端根据终端的自身类别,在 RAR MAC PDU中查找对应的随机接入回退 值进行随机接入延迟处理。 上述接入网网元中, 所述发送模块发送的所述分类设置的随机接入回退 值的信息包括第一标志,该第一标志用于指示 RAR MAC PDU中是否存在分 类设置的随机接入回退值的信息,该第一标志设置在 RAR MAC PDU的回退 子头的保留位,或者设置在 RAR MAC PDU中的最后一个随机接入响应之后 的开头位置。
上述接入网网元中, 所述发送模块发送的所述分类设置的随机接入回退
值的信息包括 用于 "指示 RAR MAC PDU中是否存在分类设置的随机接入 回退值的信息" 的标志、 分类类别标识及其对应的随机接入回退值的信息中 的一项或多项,分类设置的随机接入回退值的信息设置在 RAR MAC PDU中 的最后一个 RAR之后。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读 存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。
工业实用性 本发明针对不同终端类型、 业务类型、 以及接入优先级设置不同的 backoff 值, 从而在时间域上使得不同类型的终端的随机接入得到合理的分 布, 可以大大降低终端的接入冲突概率。 此外还可以降低不同类型或者不同 级别的终端之间对随机接入资源的竟争, 从而减轻接入拥塞。
Claims
1、 一种随机接入控制方法, 所述方法包括: 接入网网元针对终端分类的各个类别, 分类设置多个随机接入回退值; 接入网网元在向终端发送随机接入响应媒体接入控制协议数据单元 (RAR MAC PDU) , 所述 RAR MAC PDU包含分类设置的随机接入回退值的 信息; 以及 终端根据自身类别,在 RAR MAC PDU中查找对应的随机接入回退值进 行随机接入延迟处理。
2、如权利要求 1所述的方法, 其中, 所述终端分类的方式为以下方式中 的一种或组合: 按照终端是否是 H2H终端来分类, 分为 H2H终端和非 H2H终端; 按照终端分组 (group)来分类; 按照终端发起的业务类型来分类, 一个终端有一种或多种业务类型; 按照终端的接入优先级来分类, 一个终端有一个或多个接入优先级; 以 及 按照终端的协议版本来分类。
3、 如权利要求 1所述的方法, 其中: 所述分类设置的随机接入回退值的信息包括第一标志, 该第一标志用于 指示 RAR MAC PDU中是否存在分类设置的随机接入回退值的信息。
4、 如权利要求 3所述的方法, 其中: 该第一标志设置在 RAR MAC PDU的回退子头的保留位, 或者设置在 RAR MAC PDU中的最后一个随机接入响应之后的开头位置。
5、 如权利要求 1所述的方法, 其中: RAR MAC PDU中是否存在分类设置的随机接入回退值通过以下方式中 的一种隐式地指示: 终端和网络约定 RAR MAC PDU必然包含分类设置的随机接入回退值; 以及 终端和网络约定, 若 RAR MAC PDU中有回退子头, 则该 RAR MAC
PDU中包含分类设置的随机接入回退值; 若 RAR MAC PDU中没有回退子 头, 则该 RAR MAC PDU中不包含分类设置的随机接入回退值。
6、如权利要求 1所述的方法,接入网网元在向终端发送 RAR MAC PDU 的步骤之前, 所述方法还包括: 接入网网元为不同的终端的分类分配专用的随机接入前导; 以及 接入网网元检测到终端发送的随机接入前导后,确定该终端所属的类别; 接入网网元在向终端发送 RAR MAC PDU的步骤中,接入网网元在向终 端发送的 RAR MAC PDU中,只放置该终端所属的类别对应的随机接入回退 值的信息。
7、 如权利要求 1所述的方法, 其中: 终端分为 H2H终端和非 H2H终端, 所述分类设置的随机接入回退值的 信息包括一类别标识,所述类别标识用于表示是否存在非 H2H终端的随机接 入回退值的信息, 该类别标识单独设置或与一第一标志合并设置, 该第一标 志用于指示 RAR MAC PDU中是否存在分类设置的随机接入回退值的信息。
8、 如权利要求 1所述的方法, 其中: 所述分类设置的随机接入回退值的信息包括一个或多个类别标识及其对 应的随机接入回退值的信息。
9、 如权利要求 8所述的方法, 其中:
所述每一类别标识包括一类别标识值和一第二标志, 该第二标志用于表 示该类别标识后面是否还有其他类别标识, 各类别标识对应的随机接入回退 值的信息在所有类别标识之后按类别标识的顺序依次排列, 或者紧跟在各自 对应的类别标识之后。
10、 如权利要求 1所述的方法, 其中: 所述分类设置的随机接入回退值的信息包括一第三标志, 所述第三标志 用于表示 RAR MAC PDU中是否包含了终端所有类别的随机接入回退值的 信息, 如该第三标志表示 "是" , 则所述分类设置的随机接入回退值的信息 还包括按约定的顺序排列的每一类别的随机接入回退值的信息; 如该第三标 志表示 "否" , 则所述分类设置的随机接入回退值的信息还包括一个或多个 类别标识及其对应的随机接入回退值的信息。
11、 如权利要求 1所述的方法, 其中: 所述随机接入回退值的信息为随机接入回退值的序号, 每一序号对应一 个级数的随机接入回退值, 终端分为 H2H终端和非 H2H终端, 非 H2H终端 的取值值域大于或等于 H2H终端的随机接入回退值的取值值域,划分的随机 接入回退值级数大于或等于 H2H终端的随机接入回退值的级数。
12、 如权利要求 1或 7或 8或 10所述的方法, 其中: 终端分类时只按照是否是 H2H终端或者按照终端分组分类, H2H终端 对应的随机接入回退值的信息放在回退子头中, 非 H2H终端或非 H2H终端 的各个分组对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后。
13、 如权利要求 1所述的方法, 其中: 所述分类设置的随机接入回退值的信息包括 "用于指示 RAR MAC PDU 中是否存在分类设置的随机接入回退值的信息" 的标志、 分类类别标识及其 对应的随机接入回退值的信息中的一项或多项, 所述分类设置的随机接入回 退值的信息设置在 RAR MAC PDU中的最后一个 RAR之后。
14、如权利要求 1所述的方法,接入网网元在向终端发送 RAR MAC PDU 的步骤之前, 所述方法还包括: 接入网网元解出终端的随机接入前导码后, 选择不发、 发送一部分或者 发送全部的分类设置的随机接入回退值的信息。
15、 如权利要求 1或 7或 8或 10所述的方法, 其中: 终端分类时按照终端发起的业务类型或者接入优先级来分类, 随机接入 回退值的信息按以下方式中的一种设置:
(1)仅对非 H2H终端按终端发起的业务类型或者接入优先级进行分类, H2H终端对应的随机接入回退值的信息放在 backoff子头中, 非 H2H终端的 各个业务类型或者接入优先级分类对应的随机接入回退值的信息放在 RAR MAC PDU的最后一个 RAR之后; 以及
(2)对所有新版本终端均按终端发起的业务类型或者接入优先级进行分 类, 原协议版本的 H2H终端的随机接入回退值的信息放在 backoff子头中, 新版本终端的各个业务类型或者接入优先级分类对应的随机接入回退值的信 息放在 RAR MAC PDU的最后一个 RAR之后。
16、 如权利要求 1所述的方法, 其中: 终端根据自身类别,在 RAR MAC PDU中查找对应的随机接入回退值进 行随机接入延迟处理的步骤包括: 终端根据与自身类别对应的随机接入回退值的信息查找到对应的随机接 入回退值, 将终端侧的随机接入回退值设为查出的该随机接入回退值; 以及 当终端接收 RAR失败或者竟争接入时竟争失败, 且没有达到前导码最 大发射次数, 终端根据终端侧当前的随机接入回退值和预定的规则计算出下 一次随机接入的延迟时间。
17、 如权利要求 16所述的方法, 其中: 终端根据终端侧当前的随机接入回退值和预定的规则计算出下一次随机 接入的延迟时间的步骤包括: 计算该随机接入延迟时间时, 按照均匀分布的原则在 0到随机接入回退 值之间随机取一个值; 或者 终端按照 H2H和非 H2H来分类, 计算该随机接入延迟时间时, 如终端 收到的 RAR MAC PDU中既有 H2H终端的随机接入回退值 backoff!的信息, 也有非 H2H终端的随机接入回退值 backofG的信息, 则 H2H终端按照均匀 分布的原则在 0 到 backoff! 之间随机取一个值作为随机接入延迟时间; 非 H2H终端则按照均匀分布的原则在 backoff!到 backoff 1+ backoff2, 或者在 backoff!到 backofG之间随机取一个值作为随机接入延迟时间,此时 backofG 大于 backoff! ; 或者 终端按照接入优先级或发起的业务类型来分类, 按照优先级或业务类型 等级由高到低的顺序设置随机接入回退值, 每一级的随机接入延迟时间按照 均匀分布的原则在 0 到本级的随机接入回退值 + 前一级的随机接入回退值 之间随机取一个值; 或者, 每一级的随机接入延迟时间按照均勾分布的原则 在前一级的随机接入回退值到本级的随机接入回退值 + 前一级的随机接入 回退值之间随机取一个值; 或者, 每一级的随机接入延迟时间按照均勾分布 的原则在前一级的随机接入回退值到本级的随机接入回退值之间随机取一个 值。
18、 一种随机接入控制***, 所述***包括: 设置模块, 其设置为: 针对终端分类的各个类别, 分类设置多个随机接 入回退值; 发送模块, 其设置为: 在向终端发送的随机接入响应媒体接入控制协议 数据单元 (RAR MAC PDU)中包含分类设置的随机接入回退值的信息; 以及 查找模块, 以及根据终端的自身类别, 在 RAR MAC PDU中查找对应的 随机接入回退值进行随机接入延迟处理。
19、 如权利要求 18所述的***, 其中: 所述发送模块发送的所述分类设置的随机接入回退值的信息包括第一标 志,该第一标志用于指示 RAR MAC PDU中是否存在分类设置的随机接入回 退值的信息, 该第一标志设置在 RAR MAC PDU的回退子头的保留位, 或者 设置在 RAR MAC PDU中的最后一个随机接入响应之后的开头位置。
20、 如权利要求 18所述的***, 其中: 所述发送模块发送的所述分类设置的随机接入回退值的信息包括 用于 "指示 RAR MAC PDU中是否存在分类设置的随机接入回退值的信息"的标 志、 分类类别标识及其对应的随机接入回退值的信息中的一项或多项, 分类 设置的随机接入回退值的信息设置在 RAR MAC PDU中的最后一个 RAR之 后。
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