CN107182081B - scheduling authorization backoff method and device - Google Patents

scheduling authorization backoff method and device Download PDF

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Publication number
CN107182081B
CN107182081B CN201610141076.5A CN201610141076A CN107182081B CN 107182081 B CN107182081 B CN 107182081B CN 201610141076 A CN201610141076 A CN 201610141076A CN 107182081 B CN107182081 B CN 107182081B
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CN
China
Prior art keywords
backoff
terminal
dci
state
downlink
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CN201610141076.5A
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Chinese (zh)
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CN107182081A (en
Inventor
李琳
杨茜
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普天信息技术有限公司
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Priority to CN201610141076.5A priority Critical patent/CN107182081B/en
Publication of CN107182081A publication Critical patent/CN107182081A/en
Application granted granted Critical
Publication of CN107182081B publication Critical patent/CN107182081B/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/1278Transmission of control information for scheduling
    • H04W72/1289Transmission of control information for scheduling in the downlink, i.e. towards the terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1829Arrangements specific to the receiver end
    • H04L1/1864ARQ related signaling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/12Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel
    • H04W72/14Dynamic Wireless traffic scheduling ; Dynamically scheduled allocation on shared channel using a grant or specific channel

Abstract

The embodiment of the invention provides scheduling authorization backoff methods and devices, wherein the method comprises the steps of entering a backoff state by a terminal when a certain downlink opening downlink control information DCI reaches the maximum hybrid automatic repeat request HARQ transmission times and fails in transmission, and exiting the backoff state by the terminal when a base station receives an uplink opening DCI or a successful feedback message of the downlink opening DCI sent by the terminal.

Description

scheduling authorization backoff method and device

Technical Field

The embodiment of the invention relates to the technical field of wireless communication, in particular to scheduling authorization backoff methods and devices.

Background

In a wireless communication system, a scheduling algorithm of a Media Access Control (MAC) layer plays a crucial role. The scheduling module performs priority scheduling on the terminal user through information interaction between the scheduling module and the upper layer and the lower layer, and completes transmission control of physical resource allocation and Hybrid Automatic repeat request (HARQ for short). The method aims to allocate and schedule resources on a limited bandwidth under the condition of meeting the Quality of Service (Qos) requirements of users, so as to improve the spectrum efficiency and the system capacity to the maximum extent and provide satisfactory services for the users.

For multi-user and small data volume application, the size of the data packet is relatively fixed, and the time interval between the data packets also meets the rule of , generally adopts Semi-Persistent Scheduling (SPS), in Semi-Persistent Scheduling, the resources (including uplink and downlink) of the system only need to be allocated or designated times through the PDCCH, and then the same time-frequency resources can be periodically reused.

When there is service arrival in the uplink direction, the terminal initiates a Scheduling Request (SR), if there is a free sub-band to allocate resources to the user, the base station sends uplink Control Information (DCI) on the sub-band where the user resides, if the uplink DCI is still unsuccessful after the HARQ maximum retransmission is reached, the base station stops sending the DCI, waits for times of the terminal to initiate SR and then transmits the DCI, and when there is service arrival in the Downlink direction, the base station first sends paging DCI to the terminal, and if it is unsuccessful after the HARQ maximum retransmission is reached, the base station continues to send paging DCI and Downlink DCI to the terminal until the paging DCI and the Downlink DCI are successful when the next paging times of arrival are reached.

Therefore, in the prior art, when a downlink service arrives, the base station may send the paging DCI and the downlink opening DCI to the terminal, if a user unilateral drop occurs, or a user Discontinuous Reception (DRX) activation is unsuccessful, and a downlink interference causes an authorization error, the downlink opening DCI still does not succeed after reaching the HARQ maximum retransmission, and in this case, the base station may send the paging DCI and the downlink opening DCI to the terminal at each paging arrival time, which causes the downlink direction of the authorization subband to be directly occupied, thereby wasting system resources.

Disclosure of Invention

Aiming at the defects of the prior art, the embodiment of the invention provides scheduling grant backoff methods and devices, which can solve the problem that system resources are wasted because of a grant sub-band is directly occupied due to unsuccessful transmission of downlink start DCI in the prior art.

, the invention provides scheduling grant backoff methods, the method comprising:

when a downlink control information DCI of certain time reaches the maximum HARQ transmission times and the transmission fails, the terminal enters a backoff state;

and when the base station receives the successful feedback message of the uplink opening DCI or the downlink opening DCI sent by the terminal, the terminal exits the backoff state.

Preferably, the terminal entering the backoff state includes:

acquiring the backoff times of the terminal;

if the backoff number of the terminal is zero, the terminal enters a backoff state, the backoff number is added to , a backoff window is set, and the backoff is started;

and if the backoff number of the terminal is not zero, the terminal keeps the backoff state, adds to the backoff number, sets a backoff window and starts the backoff.

Preferably, the setting of the backoff window includes:

taking the lower wireless frames of the failure feedback of the base station receiving the maximum downlink starting DCI transmission times as the starting time point of the backoff window;

the backoff window is set to a length of min (Wmax, Wmin × 2) in units of radio framesn -1) (ii) a Wherein Wmax is a set maximum backoff window, Wmin is a set minimum backoff window, n is the backoff frequency, and n is more than or equal to 1;

and if the length of the backoff window is greater than or equal to Wmax, setting the length of the backoff window as Wmax.

Preferably, when the base station receives a successful feedback message of the uplink DCI or the downlink DCI sent by the terminal, the terminal exits the backoff state, including:

when the base station receives a successful feedback message of the uplink opening DCI sent by the terminal, the terminal exits the backoff state;

alternatively, the first and second electrodes may be,

when the backoff window expires, the base station sends downlink opening DCI to the terminal;

and when the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state.

Preferably, the exiting the backoff state by the terminal includes:

and the terminal exits the backoff state and clears the backoff times of the terminal.

In a second aspect, the present invention provides an scheduling grant backoff device, including:

a backoff starting unit, configured to, when a DCI reaches a maximum HARQ transmission frequency and fails to transmit, cause a terminal to enter a backoff state;

and the backoff exit unit is used for enabling the terminal to exit the backoff state when the base station receives a successful feedback message of the uplink opening DCI or the downlink opening DCI sent by the terminal.

Preferably, the backoff initiating unit is specifically configured to:

acquiring the backoff times of the terminal;

if the backoff number of the terminal is zero, the terminal enters a backoff state, the backoff number is added to , a backoff window is set, and the backoff is started;

and if the backoff number of the terminal is not zero, the terminal keeps the backoff state, adds to the backoff number, sets a backoff window and starts the backoff.

Preferably, the backoff initiating unit is further configured to:

taking the lower wireless frames of the failure feedback of the base station receiving the maximum downlink starting DCI transmission times as the starting time point of the backoff window;

the backoff window is set to a length of min (Wmax, Wmin × 2) in units of radio framesn -1) (ii) a Wherein Wmax is a set maximum backoff window, Wmin is a set minimum backoff window, n is the backoff frequency, and n is more than or equal to 1;

and if the length of the backoff window is greater than or equal to Wmax, setting the length of the backoff window as Wmax.

Preferably, the backoff exit unit is specifically configured to:

when the base station receives a successful feedback message of the uplink opening DCI sent by the terminal, the terminal exits the backoff state;

alternatively, the first and second electrodes may be,

when the backoff window expires, the base station sends downlink opening DCI to the terminal;

and when the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state.

Preferably, the backoff exit unit is further configured to:

and when the terminal exits the backoff state, clearing the backoff times of the terminal.

According to the technical scheme, the terminal enters the backoff state when the downlink starting DCI reaches the maximum HARQ transmission times and is still unsuccessful at a certain time, the terminal is in the backoff window, so that the base station cannot send the downlink starting DCI to the terminal, the situation that the subband resource is directly occupied due to the fact that the downlink starting DCI is unsuccessful is effectively avoided, the utilization rate of the subband resource is improved, and when downlink starting DCIs or the downlink starting DCI is successfully transmitted, the terminal exits the backoff state, so that the service can be continuously transmitted, and the transmission quality and the transmission delay of a terminal user are guaranteed to a certain extent at .

Of course, it is not necessary that any product or method embodying the invention achieve all of the advantages described above at the same time .

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic flowchart of scheduling grant backoff methods according to an embodiment of the present invention ;

fig. 2 is a schematic structural diagram of scheduling grant backoff devices according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.

Fig. 1 is a schematic flowchart of a scheduling grant backoff method according to an embodiment of in the present invention, where as shown in fig. 1, the method includes the following steps:

s1: and when the DCI reaches the maximum HARQ transmission times and fails in transmission, the terminal enters a backoff state.

Specifically, when a service arrives in the downlink direction, the base station sends downlink opening DCI to the terminal to inform the terminal of time-frequency resources for receiving data, and when the base station sends the downlink opening DCI to the terminal for the maximum HARQ transmission times and the transmission of the downlink opening DCI still fails, that is, when the base station does not receive the successful feedback of the downlink opening DCI, it is determined that downlink opening DCI failure events occur, and the terminal enters a backoff state at this time.

It should be noted that, after the terminal enters the backoff state, the base station cannot send downlink initiation DCI to the terminal.

S2: and when the base station receives the successful feedback message of the uplink opening DCI or the downlink opening DCI sent by the terminal, the terminal exits the backoff state.

Specifically, after entering the backoff state, the terminal is not in the backoff state, when uplink start DCI or downlink start DCI transmission succeeds, the terminal exits the backoff state and continues service transmission, thereby ensuring the transmission quality and transmission delay of the user to a certain extent at .

It should be noted that the scheduling grant backoff mechanism provided in this embodiment is only applicable to the open DCI of the end user whose uplink and downlink are in the non-scheduling state, and the rest of the DCI, such as the open DCI, the close DCI, the re-authorization DCI, the sub-band switching DCI, and the like of the end user in the transmission state in a certain direction (uplink or downlink), do not participate in backoff.

Therefore, in the embodiment, when a certain downlink starting DCI reaches the maximum HARQ transmission times and is still unsuccessful, the terminal enters the backoff state, and the terminal is in the backoff window, so that the base station cannot send the downlink starting DCI to the terminal, thereby effectively avoiding the situation that the subband resource is directly occupied due to unsuccessful downlink starting DCI, and improving the utilization rate of the subband resource, and when a certain downlink starting DCI or successful downlink starting DCI transmission, the terminal exits the backoff state, so that the service can continue to be transmitted, and thus the transmission quality and the transmission delay of the terminal user are ensured to a certain extent at .

, the entering the backoff state by the terminal in step S1 may specifically include:

a01, obtaining the backoff times of the terminal;

a02, if the backoff number of the terminal is zero, the terminal enters a backoff state, the backoff number is added to , a backoff window is set, and the backoff is started;

and A03, if the backoff number of the terminal is not zero, the terminal keeps the backoff state, adds to the backoff number, sets a backoff window and starts the backoff.

Specifically, when the terminal enters the backoff state, if the backoff number of the terminal is zero, the terminal enters the backoff state, and if the backoff number of the terminal is non-zero, the terminal maintains the backoff state, adds to the backoff number, calculates the starting point and length of the current backoff window, and starts the backoff state.

Specifically, the setting of the backoff window in step a02 and step a03 specifically includes:

taking the lower wireless frames of the failure feedback of the base station receiving the maximum downlink starting DCI transmission times as the starting time point of the backoff window;

the backoff window is set to a length of min (Wmax, Wmin × 2) in units of radio framesn -1) (ii) a Wherein Wmax is a set maximum backoff window, Wmin is a set minimum backoff window, n is the backoff frequency, and n is more than or equal to 1;

and if the length of the backoff window is greater than or equal to Wmax, setting the length of the backoff window as Wmax.

Therefore, after the length of the backoff window reaches the set maximum backoff window, the length of the backoff window is not increased any more, and then the terminal still keeps performing backoff with the set maximum backoff window until the terminal exits the backoff state.

In this embodiment, step S2 specifically includes two implementation manners:

(1) when the base station receives a successful feedback message of the uplink opening DCI sent by the terminal, the terminal exits the backoff state;

specifically, when the maximum HARQ transmission times of the uplink opening DCI is still unsuccessful, the base station stops sending the uplink opening DCI, the uplink opening DCI is not affected by the backoff state and the backoff window, and when the base station receives a successful feedback of the uplink opening DCI sent by the terminal, the terminal exits the backoff state , and then the base station sends the downlink opening DCI to the terminal after the terminal exits the backoff state.

Alternatively, the first and second electrodes may be,

(2) when the backoff window expires, the base station sends downlink opening DCI to the terminal; and when the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state.

Specifically, when the terminal is in the backoff state, the base station cannot send the downlink opening DCI to the terminal in the backoff window, and when the backoff window expires, the base station can send the downlink opening DCI to the terminal, step , if the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state, and if the downlink opening DCI does not succeed the maximum HARQ transmission number, that is, the base station does not receive any successful feedback message of the downlink opening DCI, the terminal still maintains the backoff state, resets the backoff window and starts the backoff, step , after the terminal exits the backoff state in this step, the terminal directly schedules and allocates resources.

It should be noted that, the sending of the opening DCI (uplink or downlink) must satisfy two conditions, is that the terminal is in an active state, and resources are allocable.

Accordingly, when the backoff window expires, the terminal may be in an active state or an inactive state, and the terminal in the active state may directly schedule and allocate resources, whereas the terminal in the inactive state needs to first initiate paging successfully and then transition to the active state, or transition to the active state after receiving an SR from the terminal.

, the exiting the back-off state of the terminal in step S2 specifically includes:

and the terminal exits the backoff state and clears the backoff times of the terminal.

Specifically, after the terminal exits the backoff state, the backoff number is cleared, and at this time, the base station may send downlink initiation DCI to the terminal.

Fig. 2 is a schematic structural diagram of a scheduling grant backoff device according to another embodiment of the present invention, which includes, as shown in fig. 2, a backoff initiating unit 201 and a backoff exiting unit 202, wherein:

a backoff starting unit 201, configured to, when a certain downlink start downlink control information DCI reaches the maximum HARQ transmission times and transmission fails, enable the terminal to enter a backoff state;

a backoff exit unit 202, configured to enable the terminal to exit the backoff state when the base station receives a successful feedback message of the uplink-initiated DCI or the downlink-initiated DCI sent by the terminal.

In this embodiment, the backoff starting unit 201 is specifically configured to:

acquiring the backoff times of the terminal;

if the backoff number of the terminal is zero, the terminal enters a backoff state, the backoff number is added to , a backoff window is set, and the backoff is started;

and if the backoff number of the terminal is not zero, the terminal keeps the backoff state, adds to the backoff number, sets a backoff window and starts the backoff.

In this embodiment, the backoff starting unit 201 is further configured to:

taking the lower wireless frames of the failure feedback of the base station receiving the maximum downlink starting DCI transmission times as the starting time point of the backoff window;

the backoff window is set to a length of min (Wmax, Wmin × 2) in units of radio framesn -1) (ii) a Wherein Wmax is a set maximum backoff window, Wmin is a set minimum backoff window, n is the backoff frequency, and n is more than or equal to 1;

and if the length of the backoff window is greater than or equal to Wmax, setting the length of the backoff window as Wmax.

In this embodiment, the backoff exit unit 202 is specifically configured to:

when the base station receives a successful feedback message of the uplink opening DCI sent by the terminal, the terminal exits the backoff state;

alternatively, the first and second electrodes may be,

when the backoff window expires, the base station sends downlink opening DCI to the terminal;

and when the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state.

In this embodiment, the backoff exit unit 202 is further configured to:

and when the terminal exits the backoff state, clearing the backoff times of the terminal.

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "lower" are used herein to indicate orientations and positional relationships based on those shown in the drawings, and are used for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention unless otherwise expressly specified or limited, and the terms "mounted," "connected" and "connected" should be construed as being, for example, fixedly connected, detachably connected, physically connected, mechanically connected, electrically connected, directly connected or indirectly connected through an intermediate medium, and communicating between two elements.

It should also be noted that, herein, relational terms such as , second, and the like are only used to distinguish entities or operations from another entities or operations without necessarily requiring or implying any actual such relationship or order between such entities or operations, furthermore, the terms "comprise," "include," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements does not include only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1, scheduling grant backoff method, the method comprising:
DCI is started for terminal users of which the uplink and the downlink are in an unscheduled state;
when a downlink control information DCI of certain time reaches the maximum HARQ transmission times and the transmission fails, the terminal enters a backoff state;
when a base station receives a successful feedback message of uplink opening DCI or downlink opening DCI sent by the terminal, the terminal exits the backoff state;
the terminal enters a backoff state, and downlink opening DCI cannot be sent to the terminal by the base station;
the terminal exits the backoff state and continues to transmit the service for the terminal;
the terminal enters a backoff state, comprising:
acquiring the backoff times of the terminal;
if the backoff number of the terminal is zero, the terminal enters a backoff state, the backoff number is added to , a backoff window is set, and the backoff is started;
and if the backoff number of the terminal is not zero, the terminal keeps the backoff state, adds to the backoff number, sets a backoff window and starts the backoff.
2. The method of claim 1, wherein the setting a backoff window comprises:
taking the lower wireless frames of the failure feedback of the base station receiving the maximum downlink starting DCI transmission times as the starting time point of the backoff window;
setting the length of the backoff window to be min (Wmax, Wmin × 2n-1) by taking a radio frame as a unit; wherein Wmax is a set maximum backoff window, Wmin is a set minimum backoff window, n is the backoff frequency, and n is more than or equal to 1;
and if the length of the backoff window is greater than or equal to Wmax, setting the length of the backoff window as Wmax.
3. The method of claim 1, wherein when the base station receives a successful feedback message of the uplink-initiated DCI or the downlink-initiated DCI sent by the terminal, the terminal exits the backoff state, comprising:
when the base station receives a successful feedback message of the uplink opening DCI sent by the terminal, the terminal exits the backoff state;
alternatively, the first and second electrodes may be,
when the backoff window expires, the base station sends downlink opening DCI to the terminal;
and when the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state.
4. The method according to any of claims 1-3, wherein the terminal exiting the back-off state comprises:
and the terminal exits the backoff state and clears the backoff times of the terminal.
Scheduling grant backoff apparatus of the type 5, , comprising:
DCI is started for terminal users of which the uplink and the downlink are in an unscheduled state;
a backoff starting unit, configured to, when a DCI reaches a maximum HARQ transmission frequency and fails to transmit, cause a terminal to enter a backoff state;
a backoff exit unit, configured to enable the terminal to exit a backoff state when the base station receives a successful feedback message of the uplink-initiated DCI or the downlink-initiated DCI sent by the terminal;
the terminal enters a backoff state, and downlink opening DCI cannot be sent to the terminal by the base station;
the terminal exits the backoff state and continues to transmit the service for the terminal;
the back-off starting unit is specifically configured to:
acquiring the backoff times of the terminal;
if the backoff number of the terminal is zero, the terminal enters a backoff state, the backoff number is added to , a backoff window is set, and the backoff is started;
and if the backoff number of the terminal is not zero, the terminal keeps the backoff state, adds to the backoff number, sets a backoff window and starts the backoff.
6. The apparatus of claim 5, wherein the backoff initiation unit is further configured to:
and if the length of the backoff window is greater than or equal to Wmax, setting the length of the backoff window as Wmax.
7. The apparatus according to claim 5, wherein the backoff exit unit is specifically configured to:
when the base station receives a successful feedback message of the uplink opening DCI sent by the terminal, the terminal exits the backoff state;
alternatively, the first and second electrodes may be,
when the backoff window expires, the base station sends downlink opening DCI to the terminal;
and when the base station receives a successful feedback message of the downlink opening DCI sent by the terminal, the terminal exits the backoff state.
8. The apparatus according to any of claims 5-7, wherein the backoff exit unit is further configured to:
and when the terminal exits the backoff state, clearing the backoff times of the terminal.
CN201610141076.5A 2016-03-11 2016-03-11 scheduling authorization backoff method and device CN107182081B (en)

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CN102036305B (en) * 2009-09-30 2014-05-07 华为技术有限公司 Transmitting method and receiving method of control information, devices and communication system
CN102111252B (en) * 2009-12-25 2014-03-19 中兴通讯股份有限公司南京分公司 Hybrid automatic repeat request-based repeat resource distribution method
CN102781111B (en) * 2011-05-13 2016-09-14 南京中兴软件有限责任公司 Determination method, equipment and the system that up SPS activates
CN103533575A (en) * 2013-10-23 2014-01-22 苏州微站通信科技有限公司 Method for improving transmission performance of relay station in LTE (long term evolution) small base station system
CN105306177B (en) * 2014-07-09 2019-01-04 普天信息技术有限公司 Link detection method, communication equipment and the terminal of narrow band transmission

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