[go: up one dir, main page]

WO2013155672A1 - Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence - Google Patents

Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence Download PDF

Info

Publication number
WO2013155672A1
WO2013155672A1 PCT/CN2012/074188 CN2012074188W WO2013155672A1 WO 2013155672 A1 WO2013155672 A1 WO 2013155672A1 CN 2012074188 W CN2012074188 W CN 2012074188W WO 2013155672 A1 WO2013155672 A1 WO 2013155672A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency band
wireless communication
communication device
response
interference
Prior art date
Application number
PCT/CN2012/074188
Other languages
English (en)
Inventor
Wei Zou
Zhenhong Li
Haifeng Wang
Original Assignee
Renesas Mobile Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renesas Mobile Corporation filed Critical Renesas Mobile Corporation
Priority to PCT/CN2012/074188 priority Critical patent/WO2013155672A1/fr
Publication of WO2013155672A1 publication Critical patent/WO2013155672A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the disclosure herein relates to the field of wireless communications, and more particularly to methods to avoid interference between clusters of wireless communication devices operating in a frequency band, such as an unlicensed frequency band.
  • 3GPP The Third Generation Partnership Project
  • 3GPP unites six telecommunications standards bodies, known as "Organizational Partners," and provides their members with a stable environment to produce the highly successful Reports and Specifications that define 3GPP technologies.
  • These technologies are constantly evolving through what have become known as “generations” of commercial cellular/mobile systems, 3GPP also uses a system of parallel “releases” to provide developers with a stable platform for implementation and to allow for the addition of new features required by the market.
  • Each release includes specific functionality and features that are specified in detail by the version of the 3 GPP standards associated with that release.
  • Universal Mobile Telecommunication System is an umbrella term for the third generation (3G) radio technologies developed within 3GPP and initially standardized in Release 4 and Release 99, which preceded Release 4.
  • UMTS includes specifications for both the UMTS Terrestrial Radio Access Network (UTRAN) as well as the Core Network.
  • UTRAN includes the original Wideband CDMA (W-CDMA) radio access technology that uses paired or unpaired 5-MHz channels, initially within licensed frequency bands near 2 GHz but subsequently expanded into other licensed frequency bands.
  • W-CDMA Wideband CDMA
  • “licensed frequency band” means that a particular region of the radio frequency spectrum used exclusively by a particular entity (e.g., cellular network operator) under permission from a governmental regulatory agency (e.g., Federal Communications Commission in the U. S.).
  • licensed network means a network operating in a licensed frequency band, e.g., a cellular network. Licenses to radio frequency spectrum are usually obtained by competitive bidding process, typically making them very costly.
  • LTE Long Term Evolution
  • 4G fourth-generation
  • E-UTRAN Evolved UTRAN
  • SAE System Architecture Evolution
  • EPC Evolved Packet Core
  • E- UTRAN 100 comprises one or more evolved Node B's (eNB), such as eNBs 105, 110, and 115, and one or more user equipment (UE), such as UE 120.
  • eNB evolved Node B's
  • UE user equipment
  • "user equipment” or “UE” means any wireless communication device (e.g., smartphone or computing device) that is capable of communicating with 3GPP-standard- compliant network equipment, such as UTRAN, E-UTRAN, and/or GERAN, as the second- generation (“2G”) 3GPP radio access network is commonly known.
  • 2G second- generation
  • E-UTRAN 100 is responsible for all radio-related functions in the network, including radio bearer control, radio admission control, radio mobility control, scheduling, and dynamic allocation of resources to UEs in uplink and downlink, as well as security of the communications with the UE. These functions reside in the eNBs, such as eNBs 105, 110, and 1 15.
  • the eNBs in the E-UTRAN communicate with each other via the XI interface, as shown in Fig. 1A.
  • the eNBs also are responsible for the E-UTRAN interface to the EPC, specifically the SI interface to the Mobility Management Entity (MME) and the Serving Gateway (SGW), shown collectively as MME/S-GWs 134 and 138 in Fig. 1A.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • the MME/S-GW handles both the overall control of the UE and data flow between the UE and the rest of the EPC. More specifically, the MME processes the signaling protocols between the UE and the EPC, which are known as the Non Access Stratum (NAS) protocols.
  • the S-GW handles all Internet Procotol (IP) data packets between the UE and the EPC, and serves as the local mobility anchor for the data bearers when the UE moves between eNBs, such as eNBs 105, 110, and 115.
  • IP Internet Procotol
  • unlicensed frequency band means that a particular region of the radio frequency spectrum is available for use by any entity, but often subject to rules, regulations, and/or requirements that attempt to control usage of the spectrum, e.g., to maximize the capacity or number of users.
  • unlicensed network means a network operating in an unlicensed f equency band.
  • Bluetooth and 802.11 are two technologies that utilize the unlicensed Industrial Scientific and Medical (“ISM”) frequency band located in the 2.4-2.5 GHz range of the radio spectrum.
  • ISM Industrial Scientific and Medical
  • Other unlicensed frequency bands exist across the radio frequency spectrum, as low as 6 MHz and as high as 245 GHz.
  • the overall cost per user of a local network operating in an unlicensed frequency band is much lower than a wide-area network (e.g., cellular network) operating in a licensed frequency band.
  • the lower cost is offset by the possibility of interference from other users or other local-area networks operating in the same unlicensed frequency band, which may limit availability, capacity, and/or throughput.
  • networks operating in licensed frequency bands have finite amounts of radio frequency spectrum and also may reach limits on availability, capacity, and/or throughput because.
  • the increased usage of smartphones running various applications that require sending and receiving vast amounts of data often cause cellular networks to reach or exceed the capacity of their licensed spectrum. This results in lower bandwidth or longer delays for users, which may result in complaints and termination of service (“churn”), which network operators would like to avoid.
  • One solution currently in use is for devices, such as smartphones or computing devices, to operate on both licensed and unlicensed networks.
  • smartphones and computing devices can transmit and receive on both licensed frequency bands using 3GPP-standardized radio technology, such as UMTS and/or LTE, as well as on unlicensed frequency bands using IEEE-standardized technology, such as 802.11 WiFi.
  • Transmitting and receiving data over 802.11 WiFi instead of UMTS and/or LTE is commonly known as "WiFi offloading" and may occur in various ways and under various conditions, including user-initiated, network-initiated, and device-initiated.
  • a user may turn on the 802.11 WiFi radio in their device, connect to a nearby 802.1 1 WiFi access point (AP), and communicate exclusively over that connection.
  • AP 802.1 1 WiFi access point
  • Embodiments of the disclosed method for wireless communications comprise receiving a first control signal comprising an assignment as the master device of a cluster of devices operating in a first frequency band; sensing a first interference level in the first frequency band in a first sensing period; determining a transmit condition related to a second sensing period; transmitting a second control signal in the first frequency band to the cluster of devices in response to the first interference level being less than a first interference threshold and the transmit condition being positive.
  • the first control signal is received in a second frequency band, with the first frequency band being an unlicensed frequency band and the second frequency band being a licensed frequency band,
  • the first and second control signals comprise Long Term Evolution (LTE) physical (PHY) and medium access control (MAC) protocol layers.
  • LTE Long Term Evolution
  • PHY physical
  • MAC medium access control
  • Other embodiments comprise wireless communication devices, apparatus, and/or computer- readable media embodying one or more of the disclosed methods.
  • Fig. 1A is a high-level block diagram of the architecture of the Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN) and Evolved Packet Core (EPC) network, as standardized by 3GPP;
  • LTE Long Term Evolution
  • E-UTRAN Evolved UTRAN
  • EPC Evolved Packet Core
  • Fig. IB is a high-level block diagram of the architecture of a network that utilizes offloading into unlicensed frequency bands;
  • Fig. 2 is a high-level block diagram of the architecture of a network with multiple offloaded clusters operating in proximity to each other and to a wireless local-area network, according to one or more embodiments of the present disclosure
  • Fig. 3 shows the network of Fig. 2 after certain changes have occurred to the offloaded clusters
  • Fig. 4A is a timing diagram of a transmission arrangement for avoiding interference among multiple offloaded clusters and other wireless local-area networks operating in proximity, according to one or more embodiments of the present disclosure
  • Fig. 4B is a timing diagram of another transmission arrangement for avoiding interference among multiple offloaded clusters and other wireless local-area networks operating in proximity, according to one or more embodiments of the present disclosure
  • Fig. 5 is a flowchart of an exemplary method in a master UE, according to one or more embodiments of the present disclosure
  • Fig. 6 is a flowchart of another exemplary method in a master UE, according to one or more embodiments of the present disclosure
  • Fig. 7 is a flowchart of another exemplary method in a protocol between a data transmitting device and a data receiving device according to another embodiment of the present disclosure.
  • Fig. 8 is a block diagram of an exemplary wireless communication device according to one or more embodiments of the present disclosure.
  • WiFi offloading does reduce the load on the licensed network, it does have some drawbacks.
  • the device must support two different sets of medium access control (MAC) and physical (PHY) layer functionality - one for the licensed frequency band (e.g,. 3GPP-standardized UMTS and/or LTE), and one for the unlicensed frequency band (e.g., ⁇ -standardized 802.11 WiFi). This increases the hardware and software cost and complexity of such devices.
  • MAC medium access control
  • PHY physical
  • Fig. IB is a high-level network diagram that illustrates the use of cellular-controlled offloading of traffic from licensed to unlicensed frequency bands.
  • LTE is used as merely an exemplary or illustrative radio access technology and is not limiting to the scope of the present disclosure.
  • UEs 140 and 152 communicate to eNB 160 via licensed frequency band 130, which may be any frequency band where LTE is allowed for use, such as the 700-MHz band in the U. S.
  • UE 152 is a "master UE" for offload cluster 150, which also comprises UEs 154 and 156.
  • offload cluster 150 UEs 152, 154, and 156 communicate with each other via unlicensed frequency band 158.
  • the dashed line around offload cluster 150 indicates the geographic range over which master UE 152's transmissions in unlicensed frequency band 158 can be received by other devices operating in that band, including UEs, and which master UE 152 can receive transmissions of other devices operating in unlicensed frequency band 158. For convenience, this will be referred to herein as the "effective range" of offload cluster 150.
  • the communications within offload cluster 150 may be subject to control by eNB 160, such as assigning UE 152 as master UE, aligning the timing of master UE 152's transmission in unlicensed frequency band 158 with eNB 160's transmissions in licensed frequency band 130, etc.
  • the signaling of control information from eNB 160 to master UE 152 may take place in the same licensed band 130 that eNB 160 uses to communicate with UE 140, or in a separate licensed band 130' (not shown).
  • Fig. 2 is a high-level network diagram of an exemplary network, such as an LTE network, having multiple unlicensed band offload clusters under control of a single eNB, according to certain embodiments of the present disclosure.
  • UEs 240, 212, and 252 communicate with eNB 260 via licensed frequency band 230, which may be any frequency band where LTE is allowed for use, such as the 700-MHz band in the U. S.
  • UEs 212 and 252 are assigned by eNB 260 to be master UEs for offload cluster 210 and 250, respectively.
  • UEs 212, 214, and 216 communicate with each other via unlicensed frequency band 220.
  • offload cluster 250 UEs 252, 254, and 256 communicate with each other via the same unlicensed frequency band 220.
  • the dashed lines around offload clusters 210 and 250 indicate the respective effective ranges of these offload cluster within unlicensed frequency band 220.
  • the communications within offload clusters 210 and 250 may be subject to control by eNB 260, such as assigning UEs 212 and 252 as master UEs, aligning the transmission timing of master UEs 212 and 252 in unlicensed frequency band 220 with eNB 260's transmissions in licensed frequency band 230, etc.
  • the signaling of control information from eNB 260 to master UEs 212 and 252 may take place in the same licensed band 230 that eNB 260 uses to communicate with UE 240, or in a separate licensed band 230' (not shown).
  • Fig. 2 shows another unlicensed network 280 operating in the same unlicensed frequency band 220.
  • Network 280 comprises an access point 282 and a user device 284, which communicate with each other wirelessly over unlicensed frequency band 220.
  • unlicensed network 280 may be an 802.11 WiFi network operating in the 2.4 GHZ ISM band
  • access point 282 may be an 802.11 WiFi access point (also commonly known as a "router")
  • an user device 284 may be a computing device with an 802.11 WiFi adapter.
  • Unlicensed network 280 also may be a Bluetooth personal-area network (PAN).
  • PAN personal-area network
  • unlicensed network 280 operates independent (e.g., not under control) of eNB 260.
  • the dashed line around unlicensed network 280 indicates effective range of access point 282 in unlicensed frequency band 220.
  • the dashed line around unlicensed network 280 intersects with the dashed lines around offload clusters 210 and 250, meaning that offload clusters 210 and 250 can receive the signal transmitted by unlicensed network 280, and vice versa. Since offload clusters 210 and 250 and unlicensed network 280 operate in the same unlicensed frequency band 220, unlicensed network 280 may interfere with the operation of offload clusters 210 and 250. However, since the dashed lines around offload clusters 210 and 250 do not intersect with each other, offload clusters 210 and 250 will not interfere with each other.
  • One or more of UEs 212, 214, 216, 252, 254, and 256 may be portable devices, such as mobile phones.
  • Fig. 3 shows the network of Fig. 2 (omitting non-master UEs for clarity) after master UE 252 has moved closer in proximity to master UE 212, and the distance between master UE 252 and at least one of UEs 254 and 256 has increased.
  • the effective ranges of offload clusters 210 and 250 within unlicensed frequency band 220 now overlap, causing these clusters to interfere with each other, in addition to the interference to both caused by unlicensed network 280, as discussed above,
  • Fig. 4A shows a timing diagram of an exemplary frame structure usable by one or more master UEs operating under control of a single eNB according to exemplary embodiments of the present disclosure.
  • the transmissions on the licensed band are arranged into a frame comprising (D) subframes for downlink (eNB to master UE) transmission, (U) subframes for uplink (master UE to eNB) transmission, and special (S) subframes for downlink-to-uplink switching.
  • the offloaded transmissions in the unlicensed band between master UE and other UEs in its offload cluster are arranged into frames comprising beacon (B) subframes for beacon signal transmission and traffic (Tx/Rx) subframes for at least one of transmitting (i.e., from master UE to other UEs) and receiving (i.e., to master UE from other UEs) operations.
  • the licensed band and unlicensed band transmission frames may be aligned on a common timing reference provided by the eNB.
  • the B subframe is the first subframe in the master UE's frame of offloaded, unlicensed band transmission.
  • B subframes may be repeated in a period manner (e.g., the sixth subframe in the unlicensed band transmission frame may also be a B subframe), which is effective for reducing the round-trip delay in the unlicensed offloading.
  • the first one or more symbols in the B subframe may be utilized commonly by all master UEs under control of an eNB for unlicensed band sensing purposes. This is denoted in Fig. 4A as the "Common Sensing" period.
  • the duration of the Common Sensing period (i.e., number of symbols) may be pre-arranged or configurable by the eNB controlling the master UE's offload cluster.
  • the master UE of each offload cluster determines if it is possible to use the unlicensed band during the remainder of the current frame.
  • This may be determined by detecting the amount of energy and or interference present in the bandwidth of the channel used by the master UE, and comparing that amount with predetermined or adaptable threshold that defines the maximum level under which the master UE can use the unlicensed band.
  • Energy and/or interference may be present from transmissions of other networks operating in the unlicensed band, such as access point 282 operating in unlicensed network 280, as shown in Figs. 2 and 3 and discussed above.
  • access point 282 operating in unlicensed network 280
  • CSMA/CA carrier-sense multiple-access/collision avoidance
  • the master UE with the shortest random delay will sense that the channel is free (provided that interference from other unlicensed networks is not present) and transmit scheduling information to the other UEs in its offload cluster. Meanwhile, other master UEs with longer random delays will sense the first master UE's transmission and disable their own unlicensed band transmissions to avoid collision until the beginning of the next B subframe, when they can sense the channel again.
  • the master UE may communicate the scheduling information, as well as other control information, to the other UEs using one or more symbols comprising a Packet Data Control Channel (PDCCH),
  • PDCCH Packet Data Control Channel
  • the number of symbols used by the master UE to convey the PDCCH may be configurable, either by the master UE or by the eNB.
  • the master UE that sent the PDCCH may communicate additional information to the other UEs.
  • the UEs normally transmit and receive information according to the scheduling received from the master UE via PDCCH.
  • the first one or several symbols in each scheduled subframe may be used by the UE scheduled for transmission to sense the shared unlicensed band channel.
  • the number of symbols to be utilized for sensing purposed may be pre-configured or controlled by the base station of the relevant offloading cluster. If the sensing result is negative (i.e., interference below a threshold), the UE proceeds with its scheduled transmission. On the other hand, if the sensing result is positive (i.e., interference at or above a threshold), the scheduled UE does not transmit as scheduled.
  • the threshold for this sensing operation may be the same or different from thresholds for other sensing period, and may be fixed or configurable by the master UE and/or the eNB.
  • the UE receives an assignment from its eNB to be the master UE of an offload cluster (OLC).
  • OLC offload cluster
  • the newly assigned master UE receives initialization parameters from the eNB, including frame timing, sensing periods, modes, etc.
  • the master UE senses the shared unlicensed band channel during the next Common Sensing period that occurs.
  • the master UE determines if it found interference during the Common Sensing period, such as by comparing the detected energy or interference with an interference threshold. If so, the master UE branches back to block 510 where it waits until the next Common Sensing period.
  • the master UE determines in block 515 that it found interference during the Common Sensing period, then it proceeds to block 525 where it waits for a random delay period before proceeding to block 530, where it senses the shared unlicensed band channel.
  • the master UE determines if it found interference while sensing the channel in block 530. If so, the master UE proceeds to block 510 where it waits until the next Common Sensing period.
  • the master UE determines at block 535 that it did not detect interference, then it proceeds to block 545 where it transmits the PDCCH to members of its offload cluster and, subsequently, to block 550 where it transmits and receives other information based on the scheduling information contained in the PDCCH.
  • Fig. 4B illustrates another timing diagram of an exemplary frame structure usable by one or more master UEs operating under control of a single eNB according to other exemplary embodiments of the present disclosure.
  • the frame structures of the licensed and unlicensed band transmissions by master UEs under control of a single eNB are identical to those shown in Fig. 4A and described above, unless otherwise noted below.
  • the first one or more symbols in the B subframe of Fig. 4B may be utilized commonly by all master UEs under control of an eNB as a Common Sensing period, whose duration may be pre-arranged or configurable by the eNB.
  • master UE's may detect energy and/or interference transmitted by other networks operating in the unlicensed band, such as access point 282 operating in unlicensed network 280, as shown in Figs. 2 and 3.
  • access point 282 operating in unlicensed network 280
  • master UE's Common Sensing result is greater than a threshold (i.e., positive)
  • the master UE will not utilize the unlicensed band during the period until the next beacon frame, when it will sense the channel again in the same manner.
  • a master UE will enter behave according to whether it is in neighbor discovery mode ("ND mode") or CSMA mode.
  • ND mode neighbor discovery mode
  • CSMA mode master UEs behave in a similar manner as described above with reference to Fig. 4A. Operation in ND mode enables master UEs under control of the same eNB to discover and avoid each other's interfering transmissions while avoiding the relatively long random delays used in CSMA mode.
  • all master UEs under control of a single eNB are configured to operate in ND mode when they are initially assigned to be master UEs.
  • master UEs may switch between ND and CSMA modes under various conditions. For example, a master UE may switch from ND to CSMA mode upon discovering interference during the Neighbor Discovery period, allowing the master UE to try to avoid this interference during future frames.
  • the duration of the Neighbor Discovery period may be pre-arranged or configurable by the eNB.
  • a master UE may switch from CSMA to ND mode after "N" consecutive times of not finding interference when sensing the unlicensed band channel following the random delay.
  • the value of N may be configurable and may be chosen such that reaching that value indicates a very low likelihood that a proximate interferer exists.
  • a master UE may switch between CSMA and ND modes upon receiving an indication that another master UE under control of the same eNB has switched modes in the same manner.
  • each master UE in ND mode Upon finding a negative Common Sensing result, each master UE in ND mode generates a random discovery bit using, for example, a pseudonoise (PN) sequence generator or other random binary generation methods known to persons of ordinary skill in the art.
  • PN pseudonoise
  • a master UE if a master UE generates a "0" discovery bit, it transmits a PDCCH with scheduling information immediately following the Common Sensing period.
  • a master UE if a master UE generates a "1" discovery bit, it delays for a period of time equivalent to the PDCCH duration before transmitting its own PDCCH to other members of its offload cluster. During this period, which is labeled as "Neighbor Discovery" in Fig.
  • the master UE senses the unlicensed frequency band for interference due to transmissions from other networks operating in this band, including both PDCCH transmissions from other master UEs under control of the same eNB and other unlicensed band transmissions, such as from access point 282 operating in unlicensed network 280, as shown in Figs. 2 and 3. If the master UE finds a positive result during the Neighbor Discovery period (e.g., neighbor offload cluster), it will not utilize the unlicensed band during the period until the next beacon frame, when it will sense the channel again in the manner described above. On the other hand, if the master UE finds a negative result during the Neighbor Discovery period, it will transmit a PDCCH with scheduling information to the other UEs in its offload cluster following the Neighbor Discovery period.
  • the Neighbor Discovery period e.g., neighbor offload cluster
  • Fig. 6 is a flowchart describing a method of operation of a master UE according to one or more embodiments of the present disclosure, including embodiments discussed above with reference to Fig. 4B.
  • the UE receives an assignment from its eNB to be the master UE of an offload cluster (OLC).
  • OLC offload cluster
  • the newly assigned master UE receives initialization parameters from the eNB, including frame timing, sensing periods, mode, etc.
  • the master UE will always be initialized to ND mode at this step.
  • the master UE senses the shared unlicensed band channel during the next Common Sensing period that occurs.
  • the master UE determines if it found interference during the Common Sensing period, such as by comparing the detected energy or interference with an interference threshold, which may be configurable. If so, the master UE branches back to block 610 where it waits until the next Common Sensing period.
  • the master UE proceeds to block 618 where it checks for and processes any received mode-switch notifications, such as from other master UEs controlled by the same eNB.
  • the master UE checks its mode setting. If the master UE is in ND mode, it proceeds to block 660 where it generates the discovery bit.
  • the master UE determines if the discovery bit generated in block 660 was "0" or "1". If the discovery bit was "0”, the master UE proceeds to block 680 where it transmits the PDCCH to members of its offload cluster. If the discovery bit was "1", the master UE proceeds to block 670 where it senses the shared unlicensed band channel during the Neighbor Discovery period.
  • the master UE determines if it found interference during the Neighbor Discovery period, such as by comparing the detected energy or interference with an interference threshold, which may be configurable and may be the same as or different from the threshold used in blocks 615. If it did not, the master UE proceeds to block 680 where it transmits the PDCCH to members of its offload cluster and, subsequently, to block 685 where it transmits and receives other information based on the scheduling information contained in the PDCCH.
  • an interference threshold which may be configurable and may be the same as or different from the threshold used in blocks 615.
  • the master UE determines that it detected interference during the Neighbor Discovery period, it proceeds to block 690 where it switched to CSMA mode and notifies master UEs of any known neighbor offload clusters, including any master UEs that were identified during the Neighbor Discovery period. Subsequently, in block 685, the master UE initializes a channel utilization counter ("ctr") to a value of zero, then proceeds to block 610 where it waits until the next Common Sensing period. On the other hand, if the master UE determines it is in CSMA mode at block 620, it proceeds to block 625 where it waits for a random delay period before proceeding to block 630, where it senses the shared unlicensed band channel.
  • ctr channel utilization counter
  • the master UE determines if it found interference while sensing the channel in 630, such as by comparing the detected energy or interference with an interference threshold, which may be configurable and may be the same as or different from the thresholds used in blocks 615 and/or 675. If so, the master UE proceeds to block 640 where it sets the channel utilization counter ("ctr") to a value of zero, and then proceeds to block 610 where it waits until the next Common Sensing period.
  • an interference threshold which may be configurable and may be the same as or different from the thresholds used in blocks 615 and/or 675. If so, the master UE proceeds to block 640 where it sets the channel utilization counter ("ctr") to a value of zero, and then proceeds to block 610 where it waits until the next Common Sensing period.
  • the master UE determines at block 635 that it did not detect interference, then it increments the channel utilization counter ("ctr") in block 645 and determines, in block 650, whether the counter value is greater than a channel utilization threshold, N, which may be a configurable value. If the counter does not exceed that value, then the master UE proceeds to block 680 where it transmits the PDCCH to members of its offload cluster and, subsequently, to block 685 where it transmits and receives other information based on the scheduling information contained in the PDCCH.
  • ctr channel utilization counter
  • the master UE determines in block 650 that the channel utilization counter exceeds the maximum value, it proceeds to block 655 where it switches to ND mode and notifies master UEs of any known neighbor offload clusters of this mode switch. Subsequently, the master UE branches back to block 10 where it waits until the next Common Sensing period.
  • Fig. 7 is a data flow diagram that further illustrates one or more of the embodiments described above with reference to Figs. 5 and 6.
  • the master UEs of clusters A and B (denoted “master UE A” and “master UE B", respectively) are operating in ND mode in the manner described above with reference to Figs. 5 and 6.
  • Offload clusters A and/or B subsequently move in proximity to each other such that their effective ranges overlap.
  • master UEs A and B are still operating in ND mode with discovery bits equal to "1" and "0", respectively.
  • master UE A discovers the interfering transmission of master UE B during Neighbor Discovery period. This causes master UE A to switch to CSMA mode and notify master UE B of the switch.
  • offload clusters A and B have moved such that their effective ranges no longer overlap. This is reflected at time t 3 , when both master UEs A and B have captured their local unlicensed band channel without sensing any interference during the last N sensing periods. At this point, one - or both - of master UEs A and B switch back to CSMA mode and notify the other of the switch.
  • the sequence of Fig. 7 may be repeated or rearranged in various ways according to the movements of the respective offload clusters. Additionally, a person of ordinary skill in the art would understand that the sequence of Fig. 7 can easily be augmented by the addition of other master UEs, e.g., master UEs C, D, E, etc.
  • Fig. 8 is a block diagram of exemplary wireless communication device or apparatus, such as a user equipment (UE), utilizing certain embodiments of the present disclosure, including one or more of the methods described above with reference to Figs, 4 through 7.
  • Device 800 comprises processor 810 which is operably connected to program memory 820 and data memory 830 via bus 870, which may comprise parallel address and data buses, serial ports, or other methods and/or structures known to those of ordinary skill in the art,
  • Program memory 820 comprises software code executed by processor 810 that enables device 800 to communicate with one or more other devices using protocols according to various embodiments of the present disclosure, including the 3GPP LTE PHY and MAC protocols, and improvements thereto.
  • Program memory 820 also comprises software code executed by processor 810 that enables device 800 to communicate with one or more other devices using other protocols or protocol layers, such as one or more of the 3GPP LTE higher-layer protocols; UMTS, HSPA, GSM, GPRS, EDGE, and/or CDMA2000 protocols; or any other protocols utilized in conjunction with radio transceiver 840, user interface 850, and/or host interface 860.
  • Program memory 820 further comprises software code executed by processor 810 to control the functions of device 800, including configuring and controlling various components such as radio transceiver 840, user interface 850, and/or host interface 860.
  • Such software code may be specified or written using any known or future developed programming language, such as e.g. Java, C++, C, and Assembler, as long as the desired functionality, e.g., as defined by the implemented method steps, is preserved.
  • Data memory 830 may comprise memory area for processor 810 to store variables used in protocols, configuration, control, and other functions of device 800,
  • program memory 820 and data memory 830 may comprise non-volatile memory (e.g., flash memory), volatile memory (e.g., static or dynamic RAM), or a combination thereof.
  • processor 810 may comprise multiple individual processors (not shown), each of which implements a portion of the functionality described above. In such case, multiple individual processors may be commonly connected to program memory 820 and data memory 830 or individually connected to multiple individual program memories and or data memories.
  • device 800 may be implemented in many different combinations of hardware and software including, but not limited to, application processors, signal processors, general-purpose processors, multi-core processors, ASICs, fixed digital circuitry, programmable digital circuitry, analog baseband circuitry, radio -frequency circuitry, software, firmware, and middleware.
  • Radio transceiver 840 may comprise radio-frequency transmitter and/or receiver functionality that enables device 800 to communicate with other equipment supporting like wireless communication standards.
  • radio transceiver 940 includes an LTE transmitter and receiver that enable device 800 to communicate with various E-UTRANs according to standards promulgated by 3GPP.
  • radio transceiver 840 includes circuitry, firmware, etc. necessary for device 800 to support LTE offloading to unlicensed frequency bands, at least to the extent that this functionality is implemented by other circuitry in device 800, such as processor 810 executing protocol program code stored in program memory 820.
  • radio transceiver 840 implements the LTE PHY and MAC layers, including circuitry, firmware, etc.
  • radio transceiver 840 is capable of communicating on a plurality of LTE frequency-division-duplex (FDD) frequency bands 1 through 25, as specified in 3GPP standards. In some embodiments, radio transceiver 840 is capable of communicating on a plurality of LTE time-division-duplex (TDD) frequency bands 33 through 43, as specified in 3GPP standards. In some embodiments, radio transceiver 840 is capable of communicating on a combination of these LTE FDD and TDD bands, as well as other bands that are specified in the 3GPP standards. In some embodiments, radio transceiver 840 is capable of communicating on one or more unlicensed frequency bands, such as the ISM band in the region of 2.4 GHz.
  • FDD frequency-division-duplex
  • TDD time-division-duplex
  • User interface 850 may take various forms depending on the particular embodiment of device 800.
  • device 800 is a mobile phone, in which case user interface 850 may comprise a microphone, a loudspeaker, slidable buttons, depressable buttons, a keypad, a keyboard, a display, a touchscreen display, and/or any other user- interface features commonly found on mobile phones.
  • device 800 is a data modem capable of being utilized with a host computing device, such as a PCMCIA data card or a modem capable of being plugged into a USB port of the host computing device.
  • user interface 850 may be very simple or may utilize features of the host computing device, such as the host device's display and/or keyboard.
  • Host interface 860 of device 800 also may take various forms depending on the particular embodiment of device 800.
  • host interface 860 may comprise a USB interface, an HDMI interface, or the like.
  • host interface may be a USB or PCMCIA interface.
  • device 800 may comprise more functionality than is shown in Fig. 9.
  • device 800 may also comprise functionality such as a video and/or still-image camera, media player, etc.
  • radio transceiver 840 may include circuitry necessary to communicate using multiple radio-frequency communication standards including GSM, GPRS, EDGE, UMTS, HSPA, CDMA2000, LTE, WiFi, Bluetooth, GPS, and/or others.
  • processor 810 may execute software code stored in program memory 820 to control such additional functionality.
  • a device or apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of a device or apparatus, instead of being hardware implemented, be implemented as a software module such as a computer program or a computer program product comprising executable software code portions for execution or being run on a processor.
  • a device or apparatus may be regarded as a device or apparatus, or as an assembly of multiple devices and/or apparatuses, whether functionally in cooperation with or independently of each other.
  • devices and apparatuses may be implemented in a distributed fashion throughout a system, so long as the functionality of the device or apparatus is preserved. Such and similar principles are considered as known to a skilled person.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur des procédés pour éviter un brouillage entre des dispositifs fonctionnant dans une première bande de fréquence (par exemple, sans licence) sous la commande d'un réseau fonctionnant dans une seconde bande de fréquence (par exemple, sous licence). Des modes de réalisation consistent à recevoir un premier signal comprenant une assignation au rôle de maître d'un groupe fonctionnant dans la première bande ; à détecter un brouillage dans la première bande dans une première période ; à déterminer une condition relative à une seconde période ; et si le brouillage est inférieur à un seuil et la condition est positive, à envoyer un second signal de commande dans la première bande. Des conditions comprennent le fait que le brouillage dans la première bande durant la seconde période est inférieur à un seuil ou non, une valeur de retard aléatoire, et/ou le fait qu'un bit aléatoire correspond ou non à une valeur prédéterminée. Le procédé peut fonctionner dans des modes de découverte de voisins et/ou d'évitement de collision. Le premier signal peut être reçu dans la seconde bande. Les deux signaux peuvent comprendre des couches de protocole PHY/MAC sensiblement identiques, telles que des couches PHY/MAC LTE.
PCT/CN2012/074188 2012-04-17 2012-04-17 Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence WO2013155672A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/074188 WO2013155672A1 (fr) 2012-04-17 2012-04-17 Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/074188 WO2013155672A1 (fr) 2012-04-17 2012-04-17 Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence

Publications (1)

Publication Number Publication Date
WO2013155672A1 true WO2013155672A1 (fr) 2013-10-24

Family

ID=49382796

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/074188 WO2013155672A1 (fr) 2012-04-17 2012-04-17 Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence

Country Status (1)

Country Link
WO (1) WO2013155672A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015104229A1 (fr) * 2014-01-10 2015-07-16 Siemens Aktiengesellschaft Transmission de données dans un réseau de communication segmenté
WO2015179821A1 (fr) * 2014-05-22 2015-11-26 Kyocera Corporation Affectation de ressources de communication dans une bande de fréquences non autorisée à un équipement fonctionnant dans une bande de fréquences autorisée
WO2015178660A1 (fr) * 2014-05-19 2015-11-26 Samsung Electronics Co., Ltd. Procédé et dispositif pour la détection d'interférences sur une bande sans licence
WO2016012578A1 (fr) * 2014-07-25 2016-01-28 Sony Corporation Procédé, dispositif de communication mobile, système et circuiterie pour estimer un taux d'occupation d'un canal partagé
CN105491641A (zh) * 2014-09-19 2016-04-13 电信科学技术研究院 一种发现信号的传输方法、小区发现的方法及装置
WO2016119355A1 (fr) * 2015-01-30 2016-08-04 宇龙计算机通信科技(深圳)有限公司 Procédé de transmission de données, dispositif de transmission de données et système de transmission de données
WO2016153882A1 (fr) * 2015-03-25 2016-09-29 Kyocera Corporation Transmission d'un indicateur de priorité entre des nœuds b évolués (enb) dans une bande de fréquences autorisée pour gérer des ressources de communication dans une bande de fréquences non autorisée
CN106165333A (zh) * 2014-12-10 2016-11-23 华为技术有限公司 一种发送、接收信号的方法、装置
CN106664649A (zh) * 2014-07-11 2017-05-10 株式会社Ntt都科摩 无线基站、用户终端以及无线通信系统
US9819459B2 (en) 2014-12-22 2017-11-14 Microsoft Technology Licensing, Llc Channel sensing enhancement
CN110169171A (zh) * 2017-07-10 2019-08-23 华为技术有限公司 传输数据的方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1839587A (zh) * 2003-08-19 2006-09-27 学校法人庆应义塾 无线通信装置、特别系统及通信系统
WO2009127690A1 (fr) * 2008-04-18 2009-10-22 Telefonaktiebolaget L M Ericsson (Publ) Coexistence adaptative entre différents systèmes de communication sans fil
CN102340876A (zh) * 2010-07-15 2012-02-01 诺基亚公司 设备发起的向非许可频带的卸载的方法和装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1839587A (zh) * 2003-08-19 2006-09-27 学校法人庆应义塾 无线通信装置、特别系统及通信系统
WO2009127690A1 (fr) * 2008-04-18 2009-10-22 Telefonaktiebolaget L M Ericsson (Publ) Coexistence adaptative entre différents systèmes de communication sans fil
CN102340876A (zh) * 2010-07-15 2012-02-01 诺基亚公司 设备发起的向非许可频带的卸载的方法和装置

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105900517A (zh) * 2014-01-10 2016-08-24 西门子公司 在区段化的通信网络中的数据传输
WO2015104229A1 (fr) * 2014-01-10 2015-07-16 Siemens Aktiengesellschaft Transmission de données dans un réseau de communication segmenté
US9980288B2 (en) 2014-01-10 2018-05-22 Siemens Aktiengesellschaft Data transmission in a segmented communication network
US10230480B2 (en) 2014-05-19 2019-03-12 Samsung Electronics Co., Ltd. Method and device for interference detection on unlicensed band
WO2015178660A1 (fr) * 2014-05-19 2015-11-26 Samsung Electronics Co., Ltd. Procédé et dispositif pour la détection d'interférences sur une bande sans licence
US10721748B2 (en) 2014-05-22 2020-07-21 Kyocera Corporation Communication resource scheduling for device-to-device (D2D) communication in an unlicensed frequency band
US11044737B2 (en) 2014-05-22 2021-06-22 Kyocera Corporation Physical channel structure for communication in unlicensed frequency band
US11363615B2 (en) 2014-05-22 2022-06-14 Kyocera Corporation Assignment of communication resources in an unlicensed frequency band to equipment operating in a licensed frequency band
US11683796B2 (en) 2014-05-22 2023-06-20 Kyocera Corporation Assignment of communication resources in an unlicensed frequency band to equipment operating in a licensed frequency band
US10674525B2 (en) 2014-05-22 2020-06-02 Kyocera Corporation Physical channel structure for communication in unlicensed frequency band
WO2015179811A1 (fr) * 2014-05-22 2015-11-26 Kyocera Corporation Bande de fréquences sans licence utilisant la synchronisation d'une bande de fréquences sous licence
WO2015179821A1 (fr) * 2014-05-22 2015-11-26 Kyocera Corporation Affectation de ressources de communication dans une bande de fréquences non autorisée à un équipement fonctionnant dans une bande de fréquences autorisée
US10165585B2 (en) 2014-05-22 2018-12-25 Kyocera Corporation Physical channel structure for communication in unlicensed frequency band
US9801198B2 (en) 2014-05-22 2017-10-24 Kyocera Corporation Unlicensed frequency band with licensed frequency band timing
US10098137B2 (en) 2014-05-22 2018-10-09 Kyocera Corporation Unlicensed frequency band with licensed frequency band timing
CN106664649A (zh) * 2014-07-11 2017-05-10 株式会社Ntt都科摩 无线基站、用户终端以及无线通信系统
US10154430B2 (en) 2014-07-11 2018-12-11 Ntt Docomo, Inc. Radio base station, user terminal and radio communication system
EP3169112A4 (fr) * 2014-07-11 2018-02-14 Ntt Docomo, Inc. Station de base sans fil, terminal utilisateur et système de communication sans fil
KR20170036686A (ko) * 2014-07-25 2017-04-03 소니 주식회사 공유 채널의 점유율 레벨을 추정하기 위한 방법, 모바일 통신 디바이스, 시스템, 및 회로
CN106537972B (zh) * 2014-07-25 2020-03-03 索尼公司 估计共享信道的占用水平的方法、移动通信装置、系统及电路
WO2016012578A1 (fr) * 2014-07-25 2016-01-28 Sony Corporation Procédé, dispositif de communication mobile, système et circuiterie pour estimer un taux d'occupation d'un canal partagé
US11463896B2 (en) 2014-07-25 2022-10-04 Sony Corporation Method, mobile communications device, system and circuitry for estimating an occupancy level of a shared channel
KR102415600B1 (ko) 2014-07-25 2022-07-05 소니그룹주식회사 공유 채널의 점유율 레벨을 추정하기 위한 방법, 모바일 통신 디바이스, 시스템, 및 회로
US20170150382A1 (en) * 2014-07-25 2017-05-25 Sony Corporation Method, mobile communications device, system and circuitry for estimating an occupancy level of a shared channel
CN106537972A (zh) * 2014-07-25 2017-03-22 索尼公司 用于估计共享信道的占用水平的方法、移动通信装置、系统及电路
EP3477986A1 (fr) * 2014-07-25 2019-05-01 Sony Corporation Procédé de détermination d'une indication d'un niveau d'occupation, dispositif et système de communication mobile, et circuit pour un dispositif de communication mobile
KR20210030502A (ko) * 2014-07-25 2021-03-17 소니 주식회사 공유 채널의 점유율 레벨을 추정하기 위한 방법, 모바일 통신 디바이스, 시스템, 및 회로
US10375592B2 (en) 2014-07-25 2019-08-06 Sony Corporation Method, mobile communications device, system and circuitry for estimating an occupancy level of a shared channel
KR102228206B1 (ko) 2014-07-25 2021-03-17 소니 주식회사 공유 채널의 점유율 레벨을 추정하기 위한 방법, 모바일 통신 디바이스, 시스템, 및 회로
US20190327627A1 (en) * 2014-07-25 2019-10-24 Sony Corporation Method, mobile communications device, system and circuitry for estimating an occupancy level of a shared channel
US10869211B2 (en) 2014-07-25 2020-12-15 Sony Corporation Method, mobile communications device, system and circuitry for estimating an occupancy level of a shared channel
KR20180105268A (ko) * 2014-07-25 2018-09-27 소니 주식회사 공유 채널의 점유율 레벨을 추정하기 위한 방법, 모바일 통신 디바이스, 시스템, 및 회로
EP3171642A4 (fr) * 2014-09-19 2017-08-16 China Academy of Telecommunications Technology Procédé de transmission de signal de découverte et procédé et dispositif de découverte de cellule
CN105491641B (zh) * 2014-09-19 2020-02-07 电信科学技术研究院 一种发现信号的传输方法、小区发现的方法及装置
CN105491641A (zh) * 2014-09-19 2016-04-13 电信科学技术研究院 一种发现信号的传输方法、小区发现的方法及装置
US10098058B2 (en) 2014-09-19 2018-10-09 China Academy Of Telecommunications Technology Method and apparatus of transmitting discovery signal, method and apparatus of discovering cell
CN106165333B (zh) * 2014-12-10 2019-05-10 华为技术有限公司 一种发送、接收信号的方法、装置
CN106165333A (zh) * 2014-12-10 2016-11-23 华为技术有限公司 一种发送、接收信号的方法、装置
US9819459B2 (en) 2014-12-22 2017-11-14 Microsoft Technology Licensing, Llc Channel sensing enhancement
WO2016119355A1 (fr) * 2015-01-30 2016-08-04 宇龙计算机通信科技(深圳)有限公司 Procédé de transmission de données, dispositif de transmission de données et système de transmission de données
US10694530B2 (en) 2015-03-25 2020-06-23 Kyocera Corporation Transmission of priority indicator between ENBS in a licensed frequency band to manage communication resources in an unlicensed frequency band
WO2016153882A1 (fr) * 2015-03-25 2016-09-29 Kyocera Corporation Transmission d'un indicateur de priorité entre des nœuds b évolués (enb) dans une bande de fréquences autorisée pour gérer des ressources de communication dans une bande de fréquences non autorisée
US11950276B2 (en) 2015-03-25 2024-04-02 Kyocera Corporation Transmission of priority indicator between ENBS in a licensed frequency band to manage communication resources in an unlicensed frequency band
CN110169171A (zh) * 2017-07-10 2019-08-23 华为技术有限公司 传输数据的方法和装置
CN110169171B (zh) * 2017-07-10 2021-10-15 华为技术有限公司 传输数据的方法和装置

Similar Documents

Publication Publication Date Title
JP7324779B2 (ja) チャネル化および帯域幅パート（ｂｗｐ）
WO2013155672A1 (fr) Procédé pour éviter un brouillage entre des groupes de dispositifs de communication délestés vers un spectre sans licence
US11375498B2 (en) Resource pool determination method, and terminal device
US10051478B2 (en) Method for scheduling unlicensed spectrum, user equipment, and base station
KR20200099094A (ko) 2-단계 랜덤 액세스
TWI617170B (zh) 用於授權輔助存取的未授權頻譜中無線電資源共享方法及使用此方法的相關裝置
CN109803443A (zh) 用于随机接入的方法、终端设备和网络设备
KR101736647B1 (ko) 마이그레이션 방법 및 디바이스
JP2022501869A (ja) 不連続伝送の方法とデバイス
EP2620008A1 (fr) Réutilisation de bande sans licence autonome dans réseau mixte cellulaire et de dispositif à dispositif
JP2023512807A (ja) 無線通信において、低減した能力のデバイスをサポートする方法及び装置
TW201605212A (zh) 處理授權頻帶及無授權頻帶中的通訊運作的通訊裝置
CN110771231B (zh) 传输数据的方法、终端设备和网络设备
EP3530062A1 (fr) Configuration de canaux d'accès aléatoire pour des communications sans fil
US20190342919A1 (en) Communication method in unlicensed band and device using same
WO2016010682A1 (fr) Signalisation prête à émettre pour limiter le brouillage wifi dans un spectre non autorisé
CN113329493A (zh) 一种通信方法及装置
JP7425885B2 (ja) 無線通信における物理ブロードキャストチャネル拡張
CN114946256B (zh) 一种通信方法及装置
WO2020034187A1 (fr) Procédé de communication, dispositif terminal, et dispositif de réseau
KR102501134B1 (ko) 무선 통신들에서의 유연한 다운링크 제어 신호 모니터링
WO2020061850A1 (fr) Procédé de communication, dispositif terminal et dispositif de réseau
WO2020258051A1 (fr) Procédé et appareil d'accès cellulaire
WO2020248143A1 (fr) Procédé de commande de puissance, dispositif terminal et dispositif de réseau
WO2017206056A1 (fr) Procédé de communication basé sur une bande de fréquences sans licence, dispositif et système s'y rapportant

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12874856

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12874856

Country of ref document: EP

Kind code of ref document: A1