CN106455000B - Method and device for realizing uplink access - Google Patents
Method and device for realizing uplink access Download PDFInfo
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- CN106455000B CN106455000B CN201510487574.0A CN201510487574A CN106455000B CN 106455000 B CN106455000 B CN 106455000B CN 201510487574 A CN201510487574 A CN 201510487574A CN 106455000 B CN106455000 B CN 106455000B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Abstract
The embodiment of the disclosure discloses a method for realizing uplink access at a base station end, which comprises the following steps: dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups; allocating corresponding spectrum resources to each access group, wherein in each access group, the same spectrum resources are allocated to each user terminal; in each access group, configuring an Initial Clear Channel Assessment (iCCA) boundary and a transmission boundary for each user terminal, wherein the iCCA boundary of each user terminal is configured to be positioned on the ending boundary of different time slots; and sending information of the corresponding spectrum resource, iCCA boundary and transmission boundary to each user terminal. The icac boundary and the transmission boundary may be dynamically notified to the ue in an explicit or implicit manner, or may be configured semi-statically through a higher layer signaling. The embodiment of the disclosure also discloses a method and a device for realizing uplink access at the user side.
Description
Technical Field
The embodiments of the present disclosure relate to the field of wireless communications, and in particular, to a method and an apparatus for implementing uplink access at a base station, and a method and an apparatus for implementing uplink access at a user terminal.
Background
The "Listen Before Talk" (LBT) has been agreed to be a necessary identification function in the 78 th conference of RAN1 to meet regulatory requirements for unlicensed bands in some areas, e.g., europe, for LAA systems. According to the requirements of LBT, the user should perform Clear Channel Assessment (CCA) before performing uplink transmission on the unlicensed carrier.
The main differences between the uplink transmission implemented on the unlicensed carrier compared to the operation of the existing implementations are: LBT needs to be implemented at the transmitter side before PUSCH is transmitted in LAA systems. For this case, after the ue successfully receives the uplink grant from its operating cell through the PDCCH, uplink transmission will start only when the ue successfully acknowledges the CCA. Therefore, there is a risk that: the user terminal finds that the channel is busy and cannot transmit PUSCH. This situation will increase the delay, reduce the resource usage and complicate the base station operation. Furthermore, multiple user terminals may be scheduled in one subframe in LTE. If some users are unable to successfully acquire the channel, other nodes (e.g., neighboring WIFI access points) may perceive that the channel is in an idle state and then attempt to use the channel. This results in the uplink transmission being subject to significant interference due to data transmissions by nearby competing nodes.
In order to increase the possibility of uplink transmission and the utilization rate of uplink resources of each user, the existing LBT process of uplink scheduling grant and uplink transmission on an unlicensed carrier must be enhanced.
For uplink-LBT, LBT Based on fbe (frame Based equipment) is difficult to compete with WIFI for channel access because of less chance of perception than WIFI systems. Some simulation results show that LAA upstream user throughput with FBE-based LBT is 50% -75% lower than that of other WIFI networks. Recently class 4 LBT has attracted more research interest for uplink transmission in LAA. In R1-153664, if the node decides not to perform transmission after the eCCA procedure, it allows the base station to return to the idle state as shown in fig. 1. When a node decides to transmit, only one additional iCCA is passed to check the availability of the channel. This means that a node may be in a self-delaying state and may not conduct a transmission even though the node has completed the eCCA procedure.
Based on the above two points, the embodiments of the present disclosure propose a new uplink LBT algorithm with staggered access, which is designed to increase the chance of uplink transmission of the ue on the unlicensed carrier and improve the utilization of resources.
Disclosure of Invention
To this end, a first aspect of the present disclosure provides a method for implementing uplink access at a base station, including: dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups; allocating corresponding spectrum resources to each access group, wherein in each access group, the same spectrum resources are allocated to each user terminal; in each access group, configuring an Initial Clear Channel Assessment (iCCA) boundary and a transmission boundary for each user terminal, wherein the iCCA boundary of each user terminal is configured to be positioned on the ending boundary of different time slots; and sending information of the corresponding spectrum resource, iCCA boundary and transmission boundary to each user terminal.
In one embodiment, the dividing the plurality of ues to be accessed to the base station into a plurality of access groups includes: dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups according to a first preset rule; wherein the first predetermined rule is: each subscriber terminal in each access group is able to measure reservation signals transmitted by other subscriber terminals in the access group.
In one embodiment, the dividing the plurality of ues to be accessed to the base station into a plurality of access groups includes: dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups according to a second preset rule; wherein the second predetermined rule is: each subscriber terminal in each access group is able to measure reservation signals transmitted by other subscriber terminals in the access group and group users in different interference environments.
In one embodiment, wherein the transmission boundary of each user terminal is located at the same time in the same access group.
In one embodiment, in the same access group, the transmission boundary of each ue has a plurality of corresponding positions in the time domain, wherein the positions of the transmission boundaries between different ues are staggered.
In an embodiment, in the same access group, each of the iCCA boundaries of each ue has a plurality of corresponding positions in a time domain, where the position of the iCCA boundary is the same as the position of the transmission boundary.
A second aspect of the present disclosure provides a method for implementing uplink access at a user side, including: I. acquiring information of spectrum resources allocated to an access group to which the user terminal belongs and information of an initial idle channel assessment (iCCA) boundary and a transmission boundary configured to the user terminal; and II, when the idle channel assessment of the unlicensed frequency band is qualified and the spectrum resource is not occupied by other user terminals in the access group to which the user terminal belongs before the user terminal starts to transmit the uplink data, transmitting a reservation signal on the spectrum resource to occupy the spectrum resource and realize the transmission of the uplink data.
In an embodiment, the information of the initial clear channel assessment cca boundary and the transmission boundary configured to the user terminal is obtained from signaling sent by a base station terminal, or obtained from a predefined specification.
In one embodiment, when the transmission boundary is configured at a fixed position in the time domain of the spectrum resource, step II includes: II-1, before the position of the iCCA boundary, implementing an extended clear channel assessment (eCCA); II-1-1, when the extended clear channel assessment is completed before the position of the iCCA boundary, confirming whether an end boundary of a current slot is located on the iCCA boundary: II-1-1-1, if the ending boundary of the current time slot is positioned on the iCCA boundary, transmitting a reserved signal on the spectrum resource; II-1-1-2, if the ending boundary of the current time slot is not positioned on the iCCA boundary, the user terminal enters a delay state and performs initial clear channel assessment on the following iCCA time slot; transmitting a reservation signal on the spectrum resources when the initial clear channel assessment is qualified and no reservation signal is detected; when the initial idle channel is unqualified in evaluation or a reserved signal is detected, ending the user uplink access; II-1-2, when the assessment of the extended clear channel can not be completed before the position of the iCCA boundary, ending the uplink access of the user; and II-2, transmitting uplink data from the position of the transmission boundary on the frequency spectrum resources.
In one embodiment, when the transmission boundary is configured with a plurality of positions in the time domain of the spectrum resource, step II includes II-1. before detecting a reservation signal sent by other ues in the access group, performing an extended clear channel assessment eCCA; when the evaluation of the extended clear channel is completed before the reserved signals sent by other user terminals in the access group are detected, confirming whether the ending boundary of the current time slot is positioned on the iCCA boundary: II-1-1-1, if the ending boundary of the current time slot is positioned on the iCCA boundary, transmitting a reserved signal on the next time slot of the spectrum resources; II-1-1-2, if the ending boundary of the current time slot is not positioned on the iCCA boundary, the user terminal enters a delay state and performs initial clear channel assessment on the following iCCA time slot; when the initial idle channel assessment is qualified, transmitting a reserved signal on the spectrum resource; when the initial idle channel assessment is unqualified, ending the user uplink access; II-1-2, when the evaluation of the expanded idle channel can not be completed before the reserved signals sent by other user terminals in the access group are detected, ending the uplink access of the user; II-2, on the frequency spectrum resource, starting to transmit uplink data from a second time slot after the position of the transmission boundary.
In one embodiment, the uplink access of the subscriber is terminated when the subscriber detects a reservation signal transmitted by other subscribers in the access group before transmitting the reservation signal.
A third aspect of the present disclosure provides an apparatus for implementing uplink access at a base station, including: a grouping unit, configured to divide a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups; the system comprises a spectrum allocation unit, a spectrum allocation unit and a spectrum management unit, wherein the spectrum allocation unit is used for allocating corresponding spectrum resources for each access group, and the same spectrum resources are allocated for each user terminal in each access group; a boundary setting unit, configured to configure an initial clear channel assessment icac boundary and a transmission boundary for each ue in each access group, where the icac boundary of each ue is configured to be located on an end boundary of different timeslots; and a transmitting unit, configured to transmit the corresponding spectrum resource, the iCCA boundary, and the transmission boundary information to each ue.
In one embodiment, wherein the transmission boundary of each user terminal is located at the same time in the same access group.
In one embodiment, in the same access group, the transmission boundary of each ue has a plurality of corresponding positions in the time domain, wherein the positions of the transmission boundaries between different ues are staggered.
A fourth aspect of the present disclosure provides an apparatus for implementing uplink access at a user end, including: the receiving unit is used for acquiring information of spectrum resources allocated to an access group to which the user terminal belongs and information of an initial idle channel assessment iCCA boundary and a transmission boundary configured to the user terminal; and the uplink access unit is used for implementing uplink access when the idle channel assessment of the unlicensed spectrum is qualified and the spectrum resource is not occupied by other user terminals in the access group to which the user terminal belongs before the user terminal starts to transmit uplink data.
In one embodiment, the uplink access unit includes: a position confirmation module, configured to confirm a position of the transmission boundary and/or the iCCA boundary in a time domain and a position of a current timeslot; the counting module is used for calculating the qualified times of the idle channel evaluation; a channel assessment module for implementing a clear channel assessment CCA and an initial clear channel assessment iCCA; a delay state module, configured to enable the user side to enter a delay state; the detection module is used for detecting the reservation signal so as to determine whether the reservation signal is sent by other user sides in the access group to which the detection module belongs.
The scheme of the embodiment of the disclosure can increase the access opportunity of uplink transmission and improve the utilization rate of the unlicensed carrier.
Drawings
Other features, objects and advantages of the disclosure will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a slot diagram of a class 4 LBT with self-delaying;
fig. 2 shows a flowchart of a method for implementing uplink access according to an embodiment of the present disclosure;
fig. 3 is a block diagram illustrating an apparatus for implementing uplink access at a base station according to an embodiment of the disclosure;
fig. 4 is a block diagram illustrating an apparatus for implementing uplink access at a user end according to an embodiment of the present disclosure;
fig. 5 discloses a flowchart of a method for implementing uplink access at a base station according to an embodiment of the present disclosure;
fig. 6 discloses a flowchart of a method for implementing uplink access at a base station according to an embodiment of the disclosure.
Fig. 7 shows a diagram of a user side time slot with fixed transmission boundaries according to an embodiment of the present disclosure; and
fig. 8 shows a schematic diagram of a user end time slot in case of a dynamic transmission boundary according to an embodiment of the present disclosure.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the disclosure can be practiced. The example embodiments are not intended to be exhaustive of all embodiments according to the disclosure. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims. Moreover, although the steps of a method are described in a particular order in the specification, this does not require or imply that all of the illustrated operations must be performed in the particular order in which the desired results are achieved, but rather that the steps described may be performed in an order different. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
The embodiment of the disclosure discloses a scheme of uplink access with an LBT process, which is in accordance with type 4 LBT, and can increase the access opportunity of uplink transmission and improve the utilization rate of an unlicensed carrier. In the following we first describe the basic idea of an embodiment of the present disclosure.
First, in the embodiment of the present disclosure, the base station configures a transmission boundary for each ue.
In an embodiment of the present disclosure, each ue independently performs an uplink LBT procedure for an unlicensed carrier. The base station determines a possible start position of uplink transmission of the ue based on the estimated amount of waiting time for completing enhanced clear channel assessment (eCCA) for a required number of the ues, and configures a transmission boundary for the ue. Wherein the transmission boundary indicates a possible starting position of uplink transmission of the ue in the time domain. Referring to fig. 1, if the ue completes the enhanced clear channel assessment procedure before the transmission boundary, the ue may switch to the self-delayed state and perform an Initial Clear Channel Assessment (iCCA) again on a slot before the transmission boundary to confirm the availability of the channel.
Generally, the clear channel assessment CCA needs to be performed multiple times, and the clear channel assessment can be considered to be completed only after a certain number of qualified assessments (eCCA may be considered as a combination of multiple CCA). The specific number may be represented by a random Back-off Counter (Back-off Counter) value, that is: if the random backoff value is randomly 5, the clear channel assessment needs to be performed 5 times, and the value is decremented by 1 whenever the result of one clear channel assessment is qualified. When the value is 0, it indicates that 5 qualified clear channel assessments have been successfully performed, and the clear channel assessment is complete.
In the embodiments of the present disclosure, if the random backoff value is reduced to 0 just before the transmission boundary, the ue does not have to switch to the self-delay state, nor does it have to perform the initial clear channel assessment.
In the embodiment of the present disclosure, the transmission boundary may be explicitly or implicitly notified to the ue through, for example, uplink scheduling grant signaling. Furthermore, the transmission boundaries may also be configured semi-statically through higher layer signaling or predefined in the specification. E.g., as a function of one or more of the user side identities (e.g., C-RNTI, subframe indices, etc.).
Secondly, in the embodiment of the present disclosure, the base station divides a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups, and allocates a spectrum resource to the access group.
In the prior art, a base station allocates a spectrum resource to each ue that needs to access to the base station, however, if the ue cannot access to the base station for some reason, the allocated spectrum resource is wasted. For this, the embodiments of the present disclosure divide a plurality of ues to be accessed to the base station into a plurality of access groups, and each access group has a plurality of ues to be accessed to the base station, so that the plurality of ues compete for the same spectrum resource. By this arrangement, when some ues in the group cannot use the spectrum resource, other ues in the group can use the spectrum resource for data transmission.
The grouping for the user side can be implemented based on some predetermined rules. Since the ues in the same group need to mutually sense the data transmission status of each other to avoid data collision caused by simultaneously using the same spectrum resource, each ue in each access group may be specified in the predetermined rule to be able to measure signals transmitted by other ues in the access group. The signal may include a data signal or a reservation signal, where the reservation signal is a signal that is sent by the ue to other ues in the access group to which the ue belongs and is used to indicate that the ue has occupied the spectrum resource corresponding to the access group. In addition, the predetermined rule may further specify that the ue is divided into a group as much as possible in different interference environments, so as to increase the diversity of the sensing result. The diversity of the sensing results can ensure that the idle channel evaluation results of the user terminals in the group are not always consistent, thereby improving the utilization rate of the spectrum resources.
Third, to avoid transmission collisions between ues in the same access group, in the embodiment of the present disclosure, the base station configures an initial clear channel assessment boundary (iCCA boundary) for each ue. In the same access group, the iCCA boundary of each ue is configured to be located at the end boundary of different timeslots, that is: the iCCA boundaries for each subscriber terminal are staggered.
It can be understood that if multiple ues successfully perform the initial clear channel assessment at the same time, they all use the spectrum resource to perform uplink data transmission, thereby causing data transmission collision. To avoid this problem, in the embodiment of the present disclosure, the cca boundary of each ue in each access group is staggered, so that each ue implements the cca on different slots, thereby avoiding multiple ues from successfully implementing the initial clear channel assessment at the same time.
In each access group, in order to increase the possibility of uplink access of the user terminal, multiple iCCA boundaries and/or multiple transmission boundaries may be configured for each user terminal in the time domain. Or, in order to reduce the overhead of signaling monitoring at the ue and improve LBT synchronization on multiple carriers, a fixed iCCA boundary and/or transmission boundary may be configured for each ue.
Fourth, to avoid transmission collisions, embodiments of the present disclosure also include a reservation signal (e.g., preamble). When the icac of the ue is successful, the reservation signal is sent to inform other ues in the access group to which the ue belongs that the ue has occupied the spectrum resource.
The function of the reservation signal comprises at least one or more of the following:
-for channel reservation;
-identifying whether the spectrum resources corresponding to the access group are occupied by the user terminals in the access group by detecting the reservation signal;
for the clients belonging to different access groups, the result of the CCA energy detection may be modified by the detection of the reservation signal. (otherwise, the ue of different access group cannot successfully perform energy detection because part of the frequency resources are occupied by the ue of different access group in the cell);
for the base station, the detection of the reservation signal can be used to identify the start position of the reservation signal and the start position of the data transmission and therefore the structure of the uplink frame used by the transmitter
For grouping, the base station may configure its served ues to measure and report the signal conditions it has detected on the unlicensed carriers.
Based on the above inventive concept, we will describe a method for implementing uplink access disclosed in the present disclosure in detail with reference to a device implementing the present solution by specific examples.
Fig. 2 discloses a flowchart of a method for implementing uplink access according to an embodiment of the present disclosure. The method can be implemented by the apparatus 300 for implementing uplink access at the base station side and the apparatus 400 (400') for implementing uplink access at the user side. As shown in fig. 3, the apparatus 300 for implementing uplink access on the base station side includes a receiving unit 301, a grouping unit 302, a spectrum allocating unit 303, a boundary setting unit 304, and a transmitting unit 305. As shown in fig. 4, an apparatus 400 for implementing uplink access on a user side includes: a sending unit 401, an uplink access unit 402 and a receiving unit 403, where the uplink access unit 402 includes a location confirmation module, configured to confirm a location of the transmission boundary and/or the iCCA boundary on a time domain and a location of a current timeslot; a counting module for calculating the qualified times of the idle channel assessment; a channel assessment module to implement a clear channel assessment, CCA, and an initial clear channel assessment, iCCA; a delay state module for causing the user side to enter a delay state; the detection module is used for detecting the reservation signal so as to determine whether the reservation signal is sent by other user sides in the access group to which the detection module belongs.
Fig. 5 and 6 are flowcharts of the method shown in fig. 2 at the base station and the user end, respectively.
In step 202, the grouping unit 302 in the base station 300 divides a plurality of ues, such as the ues 400 and 400', to be accessed to the base station (note that although only two ues are shown in fig. 2, the number of the ues is not limited to 2, but may be more) into a plurality of access groups, wherein the grouping may be implemented according to a certain predetermined rule.
In a particular embodiment, the predetermined rule may include: each subscriber terminal in each access group is able to measure reservation signals transmitted by other subscriber terminals in the access group. In another specific embodiment, the predetermined rule may include: the user terminals in different interference environments are grouped as much as possible to increase the diversity of the sensing results.
In step 203, based on the grouping result of the grouping unit 302, the spectrum allocation unit 303 allocates corresponding spectrum resources to each access group.
In step 204, based on the grouping result of the grouping unit 302, the boundary setting unit 304 configures an initial clear channel assessment iCCA boundary and a transmission boundary for each ue. Wherein, for each access group, the iCCA boundary of each user terminal in the group is configured to be located on the ending boundary of different time slots.
In the embodiment of the present disclosure, there are two setting manners for the transmission boundary, that is: fixed transmission boundary setting and dynamic transmission boundary setting.
Fig. 7 shows a schematic time slot diagram of a user terminal with a fixed transmission boundary according to an embodiment of the present disclosure. In this configuration, the transmission boundary of each ue is located at the same time in the same access group. As shown in this example, the iCCA boundary of client 1 is set to a position 2 slots before the transmission boundary; the location of the iCCA of the client 2 is set to be at the location of 1 slot before the transmission boundary; the location of the iCCA of the user terminal 3 is set to be at the same location as the transmission boundary.
Fig. 8 shows a schematic time slot diagram of a user terminal with dynamic transmission boundary according to an embodiment of the present disclosure. In the setting, for the same access group, the transmission boundary of each ue has a plurality of corresponding positions in the time domain, where the positions of the transmission boundaries between different ues are staggered. Correspondingly, an iCCA boundary of each ue also has a plurality of corresponding positions in a time domain, where the position of the iCCA boundary is the same as (coincides with) the position of the transmission boundary. As shown in this example, each ue has one iCCA boundary and transmission boundary every 3 slots. The interval may be set according to the number of the user terminals in the access group, for example, the number of users in the group is n, and an iCCA boundary and a transmission boundary are set every n slots.
In step 205, the transmitting unit 305 obtains the spectrum resource, the iCCA boundary, and the transmission boundary corresponding to each ue from the spectrum allocating unit 303 and the boundary setting unit 304, and transmits the spectrum resource, the iCCA boundary, and the transmission boundary corresponding to each ue 400, 400' through the indication information. Wherein the indication information may be uplink grant indication information.
Correspondingly, the receiving unit 403 of the ue receives, from the base station, the spectrum resource allocated to the access group to which the ue belongs and the initial clear channel assessment iCCA boundary and transmission boundary configured for the ue.
In another specific embodiment, the receiving unit 403 of the ue may also obtain the initial clear channel assessment cca boundary and the transmission boundary configured for the ue from a predefined specification.
In step 206, the uplink access unit 402 in each user terminal 400, 400' performs uplink access according to the result of the idle channel estimation on the spectrum resource and the occupation situation of the spectrum resource.
Referring to fig. 7, in one embodiment, when the transmission boundary is at a fixed position (i.e., fixed transmission boundary setting) in the time domain of the spectrum resource. Step 206 specifically includes the following steps:
a position confirmation module confirms the position of the transmission boundary and the iCCA boundary in the time domain. A certain number of qualified clear channel assessments are then performed by the channel assessment module, prior to the location of the iCCA boundary, the certain number being determined by a random backoff value. The uplink access unit comprises a counting module for counting the qualified times. As shown in fig. 7, the number of passes that need to be completed is denoted as n, and this value is decremented by 1 every pass.
When the qualified clear channel assessment cannot be completed a certain number of times before the position of the iCCA boundary, the uplink access procedure of the ue is ended (e.g., ue 1 in fig. 7).
When a certain number of qualified clear channel assessments can be completed before the position of the iCCA boundary, a position confirmation module confirms whether the end boundary of the current slot is located on the iCCA boundary:
-if the end boundary of the current timeslot is located on the iCCA boundary, transmitting a reservation signal on the spectrum resource by the transmitting unit 401 to occupy the spectrum resource, and starting to transmit uplink data at the transmission boundary position.
-the delay status module causes the user terminal to enter a delay (defer) state (e.g. user terminals 2, 3 in fig. 7) if the end boundary of the current slot is not located on the iCCA boundary (i.e. the iCCA boundary is on the end boundary of some slot after). And then when the delay state of a period of time reaches the iCCA time slot, the user terminal exits the delay state, and the channel evaluation module implements initial clear channel evaluation, wherein the iCCA time slot refers to a time slot in which the position of the ending boundary coincides with the position of the iCCA boundary, that is, a time slot in which the initial clear channel evaluation needs to be implemented. Then, the channel assessment module confirms the result of the iCCA and the detection module detects whether the reservation signals sent by other ues in the access group to which the ue belongs are detected. If the iCCA is qualified and the reservation signal is not detected, indicating that the spectrum resource is available, transmitting, by the transmitting unit 401, a reservation signal on the spectrum resource to preempt the spectrum resource, and starting to transmit uplink data at a later transmission boundary position (e.g., the user end 2 in fig. 7); if the iCCA is not qualified or the reservation signal is detected, it indicates that the spectrum resource is not available, and the uplink access procedure of the ue is ended (e.g., ue 3 in fig. 7).
Referring to fig. 8, in another embodiment, when the transmission boundary has a plurality of corresponding positions in the time domain of the spectrum resource (i.e., dynamic transmission boundary setting). Step 206 specifically includes the following steps:
and completing the qualified idle channel evaluation for a specific number of times by the channel evaluation module before detecting the reserved signals sent by other user terminals in the access group to which the user terminal belongs. As in the above example, the specific number of times is determined by a random backoff value and is denoted as n in the figure.
When the qualified clear channel assessment cannot be completed the specific number of times before the reservation signals sent by other ues in the access group are detected, the uplink access procedure of the ue is ended (e.g. ue 2 in fig. 8).
When the qualified clear channel assessment of the specific number of times is completed before the reservation signals sent by other user terminals in the access group are detected, the position confirmation module confirms whether the ending boundary of the current time slot is located on the iCCA boundary:
-if the end boundary of the current slot is located on said iCCA boundary, transmitting a reservation signal on the next slot by means of the transmitting unit 401 to preempt the spectrum resources and start transmitting upstream data at the second position thereafter.
-if the end boundary of the current slot is not located on the iCCA boundary (i.e. the iCCA boundary is on the end boundary of some slot after), the delay status module causes the user terminal to enter a delay (defer) state (e.g. user terminal 1 in fig. 8). And then when the delay state of a period of time reaches the iCCA time slot, the user terminal exits the delay state, and the channel evaluation module implements initial clear channel evaluation, wherein the iCCA time slot refers to a time slot in which the position of the ending boundary coincides with the position of the iCCA boundary, that is, a time slot in which the initial clear channel evaluation needs to be implemented. The channel assessment module then confirms the result of the iCCA. If the spectrum resource is qualified, it indicates that the spectrum resource is available, the sending unit 401 sends a reservation signal in the next time slot to preempt the spectrum resource, and starts sending uplink data at the second position later (for example, user end 1 in fig. 8); if not, the spectrum resource is not available, and the uplink access process of the user terminal is ended.
It should be noted that, in the contention process of the uplink access (including the CCA, and delay state period), under the condition of dynamic transmission boundary setting, the detection module may continuously perform signal detection to determine whether there is a reservation signal sent by other ues in the access group to which the ue belongs, and as long as the ue measures the reservation signal sent by other ues in the access group to which the ue belongs, the ue may end the uplink access process to avoid collision of uplink data transmission.
It will be evident to those skilled in the art that the disclosure is not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the disclosure can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it will be obvious that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Several elements recited in the apparatus claims may also be implemented by one element. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (15)
1. A method for realizing uplink access at a base station end comprises the following steps:
dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups;
allocating corresponding spectrum resources to each access group, wherein in each access group, the same spectrum resources are allocated to each user terminal;
in each access group, configuring an Initial Clear Channel Assessment (iCCA) boundary and a transmission boundary for each user terminal, wherein the iCCA boundary of each user terminal is configured to be positioned on the ending boundary of different time slots; and
and transmitting information of the corresponding spectrum resource, iCCA boundary and transmission boundary to each user terminal.
2. The method of claim 1, wherein the dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups comprises:
dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups according to a first preset rule;
wherein the first predetermined rule is: each subscriber terminal in each access group is able to measure reservation signals transmitted by other subscriber terminals in the access group.
3. The method of claim 1, wherein the dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups comprises:
dividing a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups according to a second preset rule;
wherein the second predetermined rule is: each subscriber terminal in each access group is capable of detecting reservation signals transmitted by other subscriber terminals in the access group and grouping users in different interference environments.
4. The method of claim 1, wherein the transmission boundary of each user terminal is located at the same position in the time domain in the same access group.
5. The method of claim 1, wherein the transmission boundary of each ue has a plurality of corresponding positions in the time domain in the same access group, and the positions of the transmission boundaries between different ues are staggered from each other.
6. The method of claim 4, wherein in the same access group, there are a plurality of corresponding positions in the time domain on an iCCA boundary of each user terminal, and the position of the iCCA boundary is the same as that of the transmission boundary.
7. A method for realizing uplink access at a user side comprises the following steps:
I. acquiring information of spectrum resources allocated to an access group to which the user terminal belongs and information of an initial clear channel assessment iCCA boundary and a transmission boundary configured to the user terminal, wherein the iCCA boundary of the user terminal and iCCA boundaries of other user terminals in the same access group are located on ending boundaries of different time slots;
and II, when the idle channel assessment of the unlicensed frequency band is qualified and the spectrum resource is not occupied by other user terminals in the access group to which the user terminal belongs before the user terminal starts to transmit the uplink data, transmitting a reservation signal on the spectrum resource to occupy the spectrum resource and realize the transmission of the uplink data.
8. The method according to claim 7, wherein the information of the Initial Clear Channel Assessment (iCCA) boundary and the transmission boundary configured to the user terminal is obtained from signaling sent by a base station terminal or from a predefined specification.
9. The method of claim 8, wherein when the transmission boundary is configured at a fixed location in the time domain of the spectrum resource, step II comprises:
II-1, before the position of the iCCA boundary, implementing an extended clear channel assessment (eCCA);
II-1-1, when the extended clear channel assessment is completed before the position of the iCCA boundary, confirming whether an end boundary of a current slot is located on the iCCA boundary:
II-1-1-1, if the ending boundary of the current time slot is positioned on the iCCA boundary, transmitting a reserved signal on the spectrum resource;
II-1-1-2, if the ending boundary of the current time slot is not positioned on the iCCA boundary, the user terminal enters a delay state and performs initial clear channel assessment on the following iCCA time slot;
transmitting a reservation signal on the spectrum resources when the initial clear channel assessment is qualified and no reservation signal is detected;
when the initial idle channel is unqualified in evaluation or a reserved signal is detected, ending the user uplink access;
II-1-2, when the assessment of the extended clear channel can not be completed before the position of the iCCA boundary, ending the uplink access of the user;
and II-2, transmitting uplink data from the position of the transmission boundary on the frequency spectrum resources.
10. The method of claim 8, wherein when the transmission boundary is configured with a plurality of positions in the time domain of the spectrum resource, step II comprises:
II-1, before detecting reserved signals sent by other user terminals in the access group, implementing expanded idle channel assessment eCCA;
when the evaluation of the extended clear channel is completed before the reserved signals sent by other user terminals in the access group are detected, confirming whether the ending boundary of the current time slot is positioned on the iCCA boundary:
II-1-1-1, if the ending boundary of the current time slot is positioned on the iCCA boundary, transmitting a reserved signal on the next time slot of the spectrum resources;
II-1-1-2, if the ending boundary of the current time slot is not positioned on the iCCA boundary, the user terminal enters a delay state and performs initial clear channel assessment on the following iCCA time slot;
when the initial idle channel assessment is qualified, transmitting a reserved signal on the spectrum resource;
when the initial idle channel assessment is unqualified, ending the user uplink access;
II-1-2, when the evaluation of the expanded idle channel can not be completed before the reserved signals sent by other user terminals in the access group are detected, ending the uplink access of the user;
II-2, on the frequency spectrum resource, starting to transmit uplink data from a second time slot after the position of the transmission boundary.
11. The method of claim 10, wherein the user uplink access is terminated when the user terminal detects a reservation signal transmitted by other user terminals in the access group before transmitting the reservation signal.
12. An apparatus for implementing uplink access at a base station, comprising:
a grouping unit, configured to divide a plurality of user terminals to be accessed to the base station terminal into a plurality of access groups;
the system comprises a spectrum allocation unit, a spectrum allocation unit and a spectrum management unit, wherein the spectrum allocation unit is used for allocating corresponding spectrum resources for each access group, and the same spectrum resources are allocated for each user terminal in each access group;
a boundary setting unit, configured to configure an initial clear channel assessment icac boundary and a transmission boundary for each ue in each access group, where the icac boundary of each ue is configured to be located on an end boundary of different timeslots; and
and the sending unit is used for sending the corresponding spectrum resource, the iCCA boundary and the transmission boundary information to each user terminal.
13. The apparatus of claim 12, wherein the transmission boundary of each user terminal is located at the same position in the time domain in the same access group.
14. The apparatus of claim 12, wherein the transmission boundary of each ue has a plurality of corresponding positions in the time domain in the same access group, and the positions of the transmission boundaries between different ues are staggered from each other.
15. An apparatus for implementing uplink access at a user side, comprising:
a receiving unit, configured to acquire information of spectrum resources allocated to an access group to which the user terminal belongs and information of an initial clear channel assessment icac boundary and a transmission boundary configured to the user terminal, where the icac boundary of the user terminal and icac boundaries of other user terminals in the same access group are located on end boundaries of different time slots;
and the uplink access unit is used for implementing uplink access when the idle channel assessment of the unlicensed spectrum is qualified and the spectrum resource is not occupied by other user terminals in the access group to which the user terminal belongs before the user terminal starts to send uplink data.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101355724A (en) * | 2007-07-26 | 2009-01-28 | 中兴通讯股份有限公司 | Method and apparatus for reducing information transmission conflict in mobile communication system |
| CN102209391A (en) * | 2010-03-29 | 2011-10-05 | 华为技术有限公司 | Random access resource configuration method and device |
| CN102333381A (en) * | 2011-10-28 | 2012-01-25 | 电信科学技术研究院 | Resource scheduling and data transmission methods and devices |
| CN102595633A (en) * | 2011-01-17 | 2012-07-18 | 华为技术有限公司 | Random access method, user equipment and network equipment |
-
2015
- 2015-08-10 CN CN201510487574.0A patent/CN106455000B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101355724A (en) * | 2007-07-26 | 2009-01-28 | 中兴通讯股份有限公司 | Method and apparatus for reducing information transmission conflict in mobile communication system |
| CN102209391A (en) * | 2010-03-29 | 2011-10-05 | 华为技术有限公司 | Random access resource configuration method and device |
| CN102595633A (en) * | 2011-01-17 | 2012-07-18 | 华为技术有限公司 | Random access method, user equipment and network equipment |
| CN102333381A (en) * | 2011-10-28 | 2012-01-25 | 电信科学技术研究院 | Resource scheduling and data transmission methods and devices |
Non-Patent Citations (1)
| Title |
|---|
| 《3rd Generation Partnership Project;Technical Specification Group Radio Access Network;Study on Licensed-Assisted Access to Unlicensed Spectrum;(Release 13)》;3gpp;《isearch.3gpp.org/isysquery/3b180723-59a0-4e53-8074-fb2a924795e9/1/doc/》;20150621;全文 * |
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