CN106162912B - Method and device for scheduling user equipment on uplink - Google Patents
Method and device for scheduling user equipment on uplink Download PDFInfo
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- CN106162912B CN106162912B CN201510185231.9A CN201510185231A CN106162912B CN 106162912 B CN106162912 B CN 106162912B CN 201510185231 A CN201510185231 A CN 201510185231A CN 106162912 B CN106162912 B CN 106162912B
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Abstract
The invention relates to a method and a device for scheduling user equipment on an uplink. According to one embodiment of the invention, the method includes the base station performing carrier sensing to select an operable channel in the unlicensed frequency band. The method also includes the base station receiving clustering information from the user equipment, wherein the clustering information includes at least one of geographical location information and interfered information of the user equipment. Further, the base station clusters the user equipment based on the received clustering information and according to a clustering criterion, and schedules uplink transmissions of the user equipment in the same cluster on the same one of the operable channels.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for scheduling User Equipment (UE) on an uplink in wireless communication.
Background
In the long Term Evolution (L TE, <ttranslation = 'L' &tttL <t/T >tong Term Evolution) or ITE-A technology, as user equipment increases and the demand of mobile communication for the amount of transmission data increases, the original bandwidth is gradually not used, since the new communication band cannot be rapidly increased and the use of the original communication band is already saturated, there is a need to transfer a part of the communication transmission load by using an unlicensed band (L AA) technology.
Under the licensed assisted access technology, the base station and the user equipment can use the unlicensed frequency band to perform downlink and uplink data transmission under appropriate conditions, so that the wireless communication system can be free from the limitation of the original licensed frequency band when scheduling the user equipment. However, when using the unlicensed frequency band, the uplink data transmitted from any ue to the base station needs to conform to an industry-defined standard, such as the European Telecommunications Standards Institute (ETSI) standard, which includes a minimum bandwidth required for each transmission, for example, 5MHz to be allocated to a channel in the unlicensed frequency band. The problem is that not every uplink data transmission of each single ue can meet the minimum bandwidth requirement, and in case the minimum bandwidth requirement is not met, the ues cannot use the idle unlicensed bands.
Therefore, in order to improve the feasibility of the grant assisted access technology, it is necessary to improve the scheduling manner of the user equipment on the uplink.
Disclosure of Invention
An objective of the present invention is to provide a scheduling method and apparatus for user equipment on uplink, which can utilize idle unlicensed frequency bands to the maximum extent.
A method for scheduling user equipment on a wireless communication uplink according to an embodiment of the present invention includes: the base station performs carrier detection to select an operable channel in the unlicensed frequency band; the base station receives clustering information from the user equipment, wherein the clustering information comprises at least one of geographical position information and interfered information of the user equipment; the base station clusters the user equipment based on the received clustering information and according to a clustering standard; and the base station schedules uplink transmissions of user equipments in the same cluster on the same one of the operable channels.
According to another embodiment of the invention, a method for wireless communication uplink transmission, the method comprising: the user equipment reports clustering information to a base station, wherein the clustering information comprises at least one of geographical position information and interfered information of the user equipment; receiving scheduling information of uplink transmission from a base station, wherein the scheduling information selects an operable channel in an unlicensed frequency band; performing clean channel assessment on the operable channel; and transmitting data using the operable channel when the clear channel assessment result is that the channel is clear.
An apparatus according to another embodiment of the present invention for scheduling user equipment in a wireless communication uplink, the apparatus comprising: a detector configured to perform carrier detection to select an operable channel in an unlicensed band; a receiver configured to receive clustering information from the user equipment, the clustering information including at least one of geographical location information and interfered information of the user equipment; a clustering unit configured to cluster the user equipment based on the received clustering information and according to a clustering standard; and a scheduler that schedules uplink transmissions of user equipments in the same cluster on the same one of the operable channels.
An apparatus according to another embodiment of the present invention for transmitting data in a wireless communication uplink, the apparatus comprising: a clustering information transmitter configured to report clustering information to a base station, the clustering information including at least one of geolocation information and interfered information of the user equipment; a receiver configured to receive scheduling information for the uplink transmission from the base station, the scheduling information indicating that the base station selects an operable channel selected from an unlicensed frequency band; an estimator configured to perform a clean channel estimation on the operable channel; and a data transmitter configured to transmit data using the operable channel when the clean channel assessment result is a channel clean.
The invention clusters different user equipment, so that single user equipment which cannot acquire a channel independently forms a cluster to meet the requirement of channel allocation on an unauthorized frequency band, thereby effectively improving the utilization rate of an uplink.
Drawings
The present invention is described in accordance with the accompanying drawings, in which:
FIG. 1 is a block diagram of a communication system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a communication system according to an embodiment of the present invention;
FIG. 3 is a block diagram of a communication system according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an uplink data transmission method according to an embodiment of the invention.
Fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a ue according to an embodiment of the present invention.
Detailed Description
In order that the spirit of the invention may be better understood, some preferred embodiments of the invention are described below. Invention of the invention
The following description is presented to enable one of ordinary skill in the art to make and use embodiments of the invention and is provided in the context of a particular application and its requirements. Various modifications to the embodiments of the invention will be readily apparent to those skilled in the art. And the generic principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the embodiments of the invention. Thus, the present embodiments are not intended to be limited to the embodiments shown, but are to be accorded the widest scope consistent with the principles and features disclosed herein.
Fig. 1 shows a schematic structure of a communication system 100 according to an embodiment of the present invention. Communication system 100 may be, but is not limited to, a long term evolution technology-based wireless communication system. The communication system 100 includes a base station 102, a first user equipment 104, a second user equipment 106, and a radio frequency head 110. The base station 102 uses a licensed band, a first operable channel S1 and a second operable channel S2, wherein the first operable channel S1 and the second operable channel S2 are unlicensed bands. The unlicensed frequency band may be, but is not limited to, an unlicensed frequency band defined by ETSI. The wireless radio head 110 performs data transmission and reception using the first operable channel S1 or the second operable channel S2.
The determination base station 102 is configured to perform carrier detection on the unlicensed band to determine channels having relatively low interference therein as operable channels, as determined by the first operable channel S1 and the second operable channel S2.
In addition, the base station 102 receives clustering information from the first user equipment 104 and the second user equipment 106, respectively, and the clustering information is used for determining whether the first user equipment 104 and the second user equipment 106 are suitable for clustering and performing uplink transmission in the same cluster. In an embodiment, the clustering information of the first user equipment 104 includes geographical location information of the first user equipment 104, such as geographical location coordinates or distance from the base station 102. In another embodiment, the clustering information includes interfered information of the first user equipment 104. In other embodiments, the clustering information may include geographical location information as well as interfered information. Similarly, the clustering information of the second user equipment 106 includes the geographical location information of the second user equipment 106, such as geographical location coordinates or distance from the base station 102, or interfered information of the second user equipment 106, or a combination of the two.
In an embodiment, the interfered information includes a sensing result of a user equipment (e.g., the first user equipment 104 or the second user 106) with respect to the first operable channel S1. Since the wireless radio head 110 also occupies the first operable channel S1 for data transmission and reception, the first user equipment 104 can obtain a sensing value S11 by detecting the first operable channel S1, wherein the sensing value S11 can be regarded as an interference signal to the first user equipment 104 in the communication system 100. Similarly, the second uplink signal transmitted by the second ue 106 includes a sensing value S21 of the interference signal of the radio frequency head 110 on the first operable channel S1. In one embodiment, the sensing value S11 or the sensing value S21 includes a sensed signal power value. In another embodiment, the perception value S11 or the perception value S21 is represented as a binary value by converting the perception power value. For example, when the signal power on the first operable channel S1 is sensed to be greater than a threshold of a clustering value, the sensing value S11 or the sensing value S21 is determined to be 1, otherwise the sensing value S11 or the sensing value S21 is determined to be 0. The clustering value threshold may be predefined or dynamic. In one embodiment, the clustering value threshold is a signal threshold specified by ETSI, such as-72 dBm, which is stored in the first user equipment 104 or the second user equipment 106.
In some embodiments, the first user equipment 104 or the second user 106 transmits the clustering information in response to a transmission request from the base station 102, wherein the request may include information of the first operable channel S1. The request is transmitted via a licensed band, for example, via a licensed band compliant with 3gpp (third generation partnership project) wireless communication standards.
Next, the base station 102 determines whether to cluster the first user equipment 104 and the second user equipment 106 to use the first operable channel in common according to the received clustering information and clustering criteria, wherein the clustering criteria is determined according to the transmission information amounts of the first user equipment 104 and the second user equipment 106. In an embodiment, in a case that the clustering information includes geographical location information of the first user equipment 104 or the second user equipment 106, the base station 102 determines whether the first user equipment 104 and the second user equipment 106 are close enough to each other and can be clustered. In another embodiment, in case that the clustering information includes the sensing result of the first operable channel S1, the base station 102 calculates the compatibility between the sensing value S11 and the sensing value S21 to determine whether to cluster the first user equipment 104 and the second user equipment 106 to share the first operable channel S1. In the case that the sensing values S11 and S21 contain binary values or the base station 102 converts the sensing values S11 and S21 into binary values according to the clustering value threshold, the base station 102 calculates the compatibility between the sensing values S11 and S21 to determine whether to cluster the first user equipment 104 and the second user equipment 106, wherein the compatibility represents the similarity of the sensing results of the first user equipment 104 and the second user equipment 106, and the similarity and the compatibility are positively correlated. When the sensing value S11 differs from the sensing value S21, e.g., S11 is 1 and S21 is 0, it is determined that the first user equipment 104 is incompatible with the second user equipment 106 without clustering. When the sensing value S11 and the sensing value S21 result in the same result, for example, S11 ═ S21 ═ 0, the result is compatible, and the first user equipment 104 and the second user equipment 106 can be clustered.
The base station 102 is configured to perform scheduling of an uplink transmission in response to the first user equipment 104 and the second user equipment 106 being clustered, transmit scheduling information to the first user equipment 104 and the second user equipment 106, wherein the scheduling information includes information selecting the operable channel S1, and allocate the first user equipment 104 and the second user equipment 106 to transmit uplink data on the same operable channel (i.e., the first operable channel S1). In an embodiment, the base station 102 assigns consecutive first physical resource blocks to the first user equipment 104 and consecutive second physical resource blocks to the second user equipment 106. The first physical resource block and the second physical resource block are configured in a Frequency Division Multiplexing (FDM) manner.
Subsequently, the first user equipment 104 and the second user equipment 106 perform a Clear Channel Assessment (CCA) on the operable channel S1. If the clear channel assessment result of the first ue 104 and the clear channel assessment result of the second ue 106 are both channel clear, the first ue 104 and the second ue 106 perform uplink data transmission using the operable channel S1, that is, the first ue 104 places its uplink data in the first physical resource block, and the second ue 106 places its uplink data in the second physical resource block, so as to transmit uplink data in a time-synchronized and frequency-division multiplexing manner. If the clean channel assessment is not passed, the next clean channel assessment is performed after a period of time.
In the case that the first user equipment 104 and the second user equipment 106 transmit uplink data separately without clustering, there is a possibility that the first user equipment 104 and the second user equipment 106 may fail to transmit uplink data because the respective transmission data amount of the first user equipment 104 or the second user equipment 106 is insufficient and cannot individually reach the requirement of the minimum bandwidth of the first operable channel S1. In contrast, the requirement of occupying the lowest bandwidth of the first operable channel S1 can be achieved by the present invention that the first physical resource block of the first user equipment 104 and the second physical resource block of the second user equipment 106 in the same cluster are transmitted in the frequency division multiplexing mode. On the other hand, the first ue 104 and the second ue 106 are clustered for uplink transmission, so that the signal power value can be higher than that of the first ue 104 or the second ue 106 when transmitting alone, thereby reducing the probability of error detection of other neighboring base stations and improving the reliability of uplink transmission.
Referring to fig. 1, in another embodiment, a base station 102 is configured to concurrently use multiple operable channels, such as a first operable channel S1 and a second operable channel S2, for uplink data transmission. In one embodiment, in the case where the base station 102 sends the upload cluster information request, the request further includes information specifying the second operable channel S2. The clustering information transmitted by the first user equipment 104 further comprises the sensing result, e.g. sensing value S12, of the second operable channel S2. Similarly, the cluster information transmitted by the second user equipment 106 also includes the sensing result of the second operable channel S2, such as the sensing value S22. In one embodiment, the sensing values S12 and S22 are converted to binary cluster values, such as 0 or 1, according to the cluster value threshold.
After the base station 102 receives the sensing values S12 and S22, it is determined whether to cluster the first user equipment 104 with the second user equipment 106 according to the clustering information and the clustering criteria, wherein the clustering criteria is determined according to the amount of information transmitted by the first user equipment 104 and the second user equipment 106. In an embodiment, the compatibility between the first user equipment 104 and the second user equipment 106 is defined as a similarity between the clustering information of the first user equipment 104 and the clustering information of the second user equipment 106. Specifically, the first user equipment 104 and the second user equipment 106 may be xored with their clustering information to determine the compatibility between the user equipments. For example, the sensing value S11 and the sensing value S21 are transformed into clustering values and Exclusive OR (XOR) operations are performed on the clustering values to obtain a first result. Similarly, the sensing value S12 and the sensing value S22 are transformed to obtain a clustering value, and an Exclusive OR (XOR) operation is performed on the clustering value to obtain a second result. Then, the first result and the second result are calculated, for example, averaged, to obtain a third result. The third result is then compared to a compatibility value threshold to determine if the first user device 104 is compatible with the second user device 106. In one embodiment, the third result is determined to be incompatible if the third result is greater than a compatibility value threshold. Conversely, it is determined to be compatible if the third result is not greater than the compatibility value threshold. The compatibility threshold is a proportional value, and the value of the compatibility threshold is not less than 0. In one embodiment, the compatibility threshold may be a fixed value. In another embodiment, the compatibility threshold is variable and determined by the base station 102, and can be adjusted appropriately according to, for example, the amount of information transmission between one user equipment 104 and the second user equipment 106 and the required occupied channel bandwidth.
Fig. 2 illustrates a communication system 200 according to some embodiments of the invention. Referring to fig. 1 and 2, a communication system 200 includes a base station 102, a first user equipment 104, a second user equipment 106, and neighboring base stations 204, 206. The base station 102 is configured to use the unlicensed frequency band, e.g., the first operable channel S1, for uplink data transmissions. In addition, the neighboring base stations 204 and 206 transmit the reference signals R1, R2 to the first user equipment 104 or the second user equipment 106 via the licensed bands, respectively, wherein the neighboring base stations 204 and 206 may transmit the reference signals using the same licensed band or different licensed bands.
Referring to fig. 2, a communication system 200 is configured to determine that a user equipment is using a first operable channel S1 for uplink data transmission. In some embodiments, the base station 102 is configured to sense a first operable channel S1 to determine whether to determine to use the first operable channel.
In addition, the base station 102 receives clustering information from each of the first user equipment 104 and the second user equipment 106, where the clustering information is used to determine whether the first user equipment 104 and the second user equipment 106 are suitable for clustering and perform uplink transmission in the same cluster, and the clustering information includes at least one of geographical location information and interfered information of the user equipment 104 and the second user equipment 106.
In an embodiment, the interfered information includes interference levels received by user equipment (e.g., the first user equipment 104 or the second user 106) with respect to reference signals R1, R2 transmitted by neighboring base stations 204 or 206. The first ue 104 can obtain interference levels S11 and S12 by detecting the reference signals R1 and R2, wherein the interference levels S11 and S12 can be regarded as interference levels of the neighboring base stations 204 and 206 to the first ue 104. Similarly, the second ue 106 can obtain the interference levels S21 and S22 by detecting the reference signals R1 and R2, respectively. The interference level includes Signal Power values of the sounding Reference signals R1, R2, such as Reference Signal Receiving Power (RSRP). In some embodiments, the first user equipment 104 or the second user 106 transmits the interfered information in response to the base station 102 transmitting a request.
In case the interference level of the reference signals R1, R2 is available as clustering information, the base station 102 calculates the compatibility of the first user equipment 104 and the second user equipment 106 based on the received clustering information and according to the clustering criteria to determine whether to cluster the first user equipment 104 with the second user equipment 106 to use the first operable channel S1. In an embodiment, the compatibility of the first user equipment 104 and the second user equipment 106 is defined as how similar the interference levels S11, S12 of the first user equipment 104 to the reference signals R1, R2 of the neighboring base stations 204, 206 are to the interference levels S21, S22 of the second user equipment 106 to the reference signals R1, R2 of the neighboring base stations 204, 206. For example, the interference levels S11 and S21 are respectively converted into clustering values, and then Exclusive-OR (XOR) operations are performed to obtain a first result, wherein the clustering values can be compared with the clustering value threshold to obtain binary values, such as 0 OR l. In this embodiment, the clustering value threshold may be dynamic and determined by the base station. Similarly, the interference level S12 and the interference level S22 are respectively converted into clustering values and then subjected to Exclusive OR (XOR) operation to obtain a second result. The first result and the second result are calculated, for example, averaged, to obtain a third result. The third result is then compared to the compatibility threshold to determine whether the first user device 104 and the second user device 106 are compatible, wherein the third result is determined to be incompatible if the third result is greater than the compatibility threshold. Conversely, it is determined to be compatible if the third result is not greater than the compatibility value threshold.
Fig. 3 shows a schematic diagram of a communication system 300 according to some embodiments of the present invention. The communication system 300 comprises, in addition to the base station 102, the neighboring base stations 204, 206, the radio frequency head 110, the first user equipment 102, the second user equipment 106, neighboring base stations 302, 304, 306, 308, a third user equipment 310, a fourth user equipment 312, and a fifth user equipment 314. The radio frequency head 110 uses six operable channels S1-S6, i.e., a first operable channel, a second operable channel, a third operable channel, a fourth operable channel, a fifth operable channel and a sixth operable channel, in the unlicensed band.
In the present embodiment, the base station 102 performs carrier sensing to select the operable channels S1-S6 in accordance with the method of clustering user equipments described in the foregoing description. The first user equipment 104, the second user equipment 106, the third user equipment 310, the fourth user equipment 312 and the fifth user equipment 314 respectively transmit clustering information to the base station 102. In one embodiment, the clustering information comprises respective sensing values of the five ues for the six operable channels S1-S6, and the sensing values are represented by binary values. In another embodiment, the cluster information respectively includes interference level reception values of the five ues to the reference signals of the neighboring base stations 204, 206, 302, 304, 306, 308.
For example, the base station determines a clustering value of each of the ue based on the received clustering information and according to a clustering value threshold, and determines a compatibility between the ues according to the clustering values, wherein the clustering values received by the base station 102 can be represented in the following table.
After receiving the clustering information, the base station 102 performs clustering on the five pieces of user equipment according to a clustering standard based on the received clustering information, where the clustering standard includes the amount of information transmitted by the user equipment. The calculation of the degree of compatibility can be expressed in the following manner.
Wherein c istiA clustering value of the ith interfered information for the t user equipmentThe interfered information is, for example, the sensing result of the ith user equipment to the ith operable channel or the interference level of the ith user to the ith adjacent base station, and ctiHaving binary values of 0 and 1. M is the total number of operable channels or the number of neighboring base stations, and M is 6 in this embodiment. The compatibility threshold is represented by x, which is a value less than 1 but not less than 0.
Taking the above table as an example, when x is 0.2, the following compatibility matrix can be obtained.
Wherein the (i, j) th element of the compatibility matrix represents the compatibility result of the i-th UE and the j-th UE, and result 1 represents compatibility and result 0 represents incompatibility.
The base station 102 clusters the ue according to the compatibility matrix and other items in the clustering standard. As can be seen from the compatibility matrix, for example, the first ue 104 is compatible with the second ue 106, the third ue 310, and the fifth ue 314, but is not compatible with the fourth ue 312. Furthermore, it can also be known from the compatibility matrix that the fifth ue 314 is incompatible with either the second ue 106 or the third ue 310. Thus, the first user equipment 104, the second user equipment 106, and the third user equipment 310 are all compatible with each other and thus can be clustered. Furthermore, the first user device 104 and the fifth user device 314 appear to be compatible with each other and thus may be additionally clustered. In some embodiments, the clustering criterion also considers the data transmission amount of the user equipment, so that the bandwidth occupied by the data transmission amount aggregated by the user equipment in the same cluster can reach the minimum bandwidth of the uplink transmission required by the unlicensed frequency band.
Fig. 4 shows a flow chart of a method 400 for uplink data transmission according to some embodiments of the present invention. In step 402, a base station performs carrier sensing of unlicensed frequency bands and selects an operable channel.
In step 404, the user equipment reports the clustering information to the base station. The clustering information includes at least one of geographical location information of the UE and interfered information including at least one of a sensing result of the operable channel and an interference level of a neighboring base station. Step 404 may be performed prior to step 402 or concurrently with step 402.
In step 406, after receiving the clustering information, the base station clusters the ue according to the clustering criteria based on the received clustering information. According to the clustering result, the base station schedules uplink transmission of the user equipment in the same cluster on the same one of the operable channels and transmits scheduling information to the user equipment, wherein the scheduling information selects an operable channel in the unlicensed frequency band.
In step 408, in response to determining to cluster the first ue and the second ue, the co-cluster ue performs a Clear Channel Assessment (CCA) in synchronization.
In step 410, the user equipment determines whether the operable channel is evaluated by a clean channel. If the clear channel assessment results of the ues in the same cluster are all channel clear, then in step 412, the ues in the same cluster use the same operable channel for uplink data transmission. If the clean channel assessment is not passed, then after a period of time, the process returns to step 408 for the next clean channel assessment.
Fig. 5 shows a schematic diagram of a base station 500 according to some embodiments of the invention. The base station 500 includes a detector 502, a receiver 504, a cluster 506, a scheduler 508, and a transmitter 510.
The detector 502 is configured to perform carrier detection to select an operable channel in the unlicensed band.
The receiver 504 is configured to receive clustering information from a user equipment, the clustering information including at least one of geographical location information and interfered information of the user equipment. The interfered information includes at least one of the sensing result of the operable channel and the interference level of all neighboring base station channels. In an embodiment, the clustering information received by the receiver 504 from the ue contains a clustering value, which is 0 or 1.
The clusterer 506 is configured to cluster the user equipment based on the received clustering information and according to a clustering criterion. The clustering criterion includes an amount of information transmitted by the ue. In one embodiment, the clustering unit 506 determines a clustering value for each of the ue based on the received clustering information and according to a clustering value threshold, and determines a compatibility between the ue according to the clustering value. In another embodiment, the compatibility is further determined by a compatibility threshold, which is dynamic or predefined. In another embodiment, the cluster value is 0 or 1, and the compatibility between the ues is determined by performing an exclusive or operation on the cluster value.
The scheduler 508 is configured to schedule uplink transmissions for user equipments in the same cluster on the same one of the operable channels. In one embodiment, the UE in the same cluster performs the uplink transmission on the same operable channel by frequency division multiplexing
The transmitter 510 is configured to issue a request back to the ue for clustering information, the request including the operable channel selected by the detector 502.
Fig. 6 shows a schematic diagram of a user equipment 600 according to some embodiments of the invention. The user equipment 600 includes a cluster information transmitter 602, a receiver 604, an estimator 604, and a data transmitter 608. In an embodiment, the user equipment 600 performs uplink transmission on the same operable channel with other devices in the same cluster in a frequency division multiplexing manner.
The clustering information transmitter 602 is configured to report clustering information to a base station, the clustering information including at least one of geolocation information and interfered information of the user equipment. In one embodiment, the interfered information includes at least one of a sensing result of the operable channel and an interference level of a neighboring base station. In another embodiment, the clustering information transmitter 602 transmits the clustering information as a clustering value. In one embodiment, the clustering value is 0 or 1.
The estimator 606 is configured to perform a clean channel estimation on the operable channel.
The data transmitter 608 is configured to transmit data using the operable channel when the clean channel assessment result is a clean channel.
The methods and programs described above may be embodied in code and/or data, which may be stored in a non-transitory computer readable storage medium as described above. When a computer system reads and executes the code and/or data stored on the non-transitory computer-readable storage medium, the computer system performs the methods and programs embodied as data structures and code and stored in the non-transitory computer-readable storage medium. Furthermore, the described methods and programs may be embodied in hardware modules. For example, the hardware modules may include, but are not limited to, Application Specific Integrated Circuit (ASIC) chips, programmable gate arrays (FPGAs), and other now known or later developed programmable logic devices. When the hardware module is started, the hardware module executes the methods and programs contained in the hardware module.
While the foregoing has been with reference to the disclosure of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention should not be limited to the disclosure of the embodiments, but should include various alternatives and modifications without departing from the invention, which are covered by the claims of the present patent application.
Claims (30)
1. A method for scheduling user equipment on a wireless communication uplink, the method comprising:
the base station performs carrier detection to select an operable channel in the unlicensed frequency band;
the base station receives clustering information from the user equipment, wherein the clustering information comprises at least one of geographical position information and interfered information of the user equipment;
the base station clusters the user equipment based on the received clustering information and according to a clustering standard; and
the base station schedules uplink transmissions of user equipments in the same cluster on the same one of the operable channels.
2. The method of claim 1, further comprising the base station issuing a request to the user equipment to upload the clustering information, and the request comprising the operable channel selected by the base station.
3. The method according to claim 1, wherein the user equipments in the same cluster are frequency division multiplexed for the uplink transmission on the same operable channel.
4. The method of claim 1, wherein the interfered information comprises at least one of a perception of the operable channel and an interference level of a neighboring base station.
5. The method of claim 1, wherein the clustering criteria comprises an amount of information transmitted by the user equipment.
6. The method of claim 1, further comprising the base station determining a clustering value for each of the user equipments based on the received clustering information and according to a clustering value threshold, and determining a degree of compatibility among the user equipments from the clustering values.
7. The method of claim 6, wherein the clustering value is 0 or 1, and the degree of compatibility between the user equipments is determined by XOR-ing the clustering values.
8. The method of claim 6, wherein the compatibility is further determined by a compatibility threshold, the compatibility threshold being dynamic or predefined.
9. The method of claim 1, further comprising clustering information received by the base station from the user equipment comprises a clustering value, wherein the clustering value is 0 or 1.
10. A method for wireless communication uplink transmissions, the method comprising:
the method comprises the steps that user equipment reports clustering information to a base station, wherein the clustering information comprises at least one of geographical position information and interfered information of the user equipment;
receiving scheduling information for the uplink transmission from the base station, the scheduling information indicating an operable channel selected by the base station from an unlicensed frequency band;
performing a clean channel assessment on the operable channel; and
and when the clear channel evaluation result is that the channel is clear, the operable channel is used for transmitting data.
11. The method of claim 10, wherein the user equipment transmits data on the same operable channel with other user equipment in the same cluster in a frequency division multiplexed manner.
12. The method of claim 10, wherein the interfered information comprises at least one of a perception of the operable channel and an interference level of a neighboring base station.
13. The method of claim 10, further comprising the user equipment receiving a requirement from the base station to upload clustering information, the requirement comprising an operable channel selected by the base station for carrier sensing.
14. The method of claim 10, further comprising communicating the clustering information in a clustering value.
15. The method of claim 14, wherein the clustering value is 0 or 1.
16. An apparatus for scheduling user equipment in a wireless communication uplink, the apparatus comprising:
a detector configured to perform carrier detection to select an operable channel in an unlicensed band;
a receiver configured to receive clustering information from the user equipment, the clustering information including at least one of geographical location information and interfered information of the user equipment; a clustering unit configured to cluster the user equipment based on the received clustering information and according to a clustering standard; and
a scheduler that schedules uplink transmissions for user equipments in the same cluster on the same one of the operable channels.
17. The apparatus of claim 16, further comprising a transmitter configured to issue a request to the user equipment for return clustering information, the request comprising the operable channel selected by the detector.
18. The apparatus of claim 16, wherein the user equipments in the same cluster are frequency division multiplexed for the uplink transmission on the same operable channel.
19. The device of claim 16, wherein the interfered information comprises at least one of a perception of the operable channel and interference levels of all neighboring base station channels.
20. The apparatus of claim 16, wherein the clustering criteria comprises an amount of information transmitted by the user equipment.
21. The apparatus of claim 16, further determining a clustering value for each of the user equipments based on the received clustering information and according to a clustering value threshold, and determining a degree of compatibility among the user equipments from the clustering values.
22. The apparatus of claim 21, wherein the compatibility is further determined by a compatibility threshold, the compatibility threshold being dynamic or predefined.
23. The apparatus of claim 21, wherein the clustering value is 0 or 1, and the compatibility between the ues is determined by xoring the clustering values.
24. The apparatus of claim 16, wherein the clustering information received by the receiver from the user equipment comprises a clustering value, the clustering value being 0 or 1.
25. An apparatus for transmitting data in a wireless communication uplink, the apparatus comprising:
a clustering information transmitter configured to report clustering information to a base station, the clustering information including at least one of geographical location information and interfered information of a user equipment;
a receiver configured to receive scheduling information for the uplink transmission from the base station, the scheduling information indicating that the base station selects an operable channel selected from an unlicensed frequency band;
an estimator configured to perform a clean channel estimation on the operable channel; and
a data transmitter configured to transmit data using the operable channel when the clean channel assessment result is a clear channel.
26. The apparatus of claim 25, the uplink transmission is made on a same operable channel with other apparatuses in a same cluster in a frequency division multiplexed manner.
27. The device of claim 25, wherein the interfered information comprises at least one of a perception of the operable channel and an interference level of a neighboring base station.
28. The apparatus of claim 25, wherein the receiver further comprises a request to upload cluster information from the base station, and the request comprises an operable channel selected by the base station for carrier sensing.
29. The device of claim 25, wherein the clustering information transmitter further comprises transmitting the clustering information with a clustering value.
30. The apparatus of claim 29, wherein the clustering value is 0 or 1.
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| CN102612042A (en) * | 2012-04-13 | 2012-07-25 | 北京邮电大学 | Perception-based frequency spectrum self-management method in femtocell network |
| CN104159313A (en) * | 2014-08-07 | 2014-11-19 | 重庆邮电大学 | Reliable communication based femtocell user clustering method in cognition heterogenous network |
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| CN102612042A (en) * | 2012-04-13 | 2012-07-25 | 北京邮电大学 | Perception-based frequency spectrum self-management method in femtocell network |
| CN104159313A (en) * | 2014-08-07 | 2014-11-19 | 重庆邮电大学 | Reliable communication based femtocell user clustering method in cognition heterogenous network |
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