JP6527933B2 - Physical channel design for network assisted D2D - Google Patents

Description

  Embodiments herein relate to network nodes and methods thereof. In particular, the embodiments herein relate to physical channel multiplexing.

  Devices such as user equipments (UEs) are also known, for example as mobile terminals, wireless terminals and / or mobile stations. The device is capable of communicating wirelessly in one or more wireless communication systems, sometimes referred to as a cellular wireless system or cellular network. The communication may be, for example, between two devices included in a wireless communication system, between the device and a regular telephone, and / or a radio access network (RAN) and possibly one or more core networks. Can be performed between the device and the server.

  The device may also be referred to as a cell phone, a cellular phone or a laptop with wireless capabilities, to name a few other examples. Devices in this context may be, for example, portable, pocketable, hand-held, computer-embedded or on-vehicle portable, capable of communicating voice and / or data with another entity such as a device or server via RAN, for example. It may be a device.

  A wireless communication system covers a geographical area which is divided into a plurality of cell areas, each cell area being a base station (e.g. "eNB", "eNodeB", "depending on the technology and terminology used. A service is provided by a radio base station (RBS) or BTS (radio base station apparatus) sometimes referred to as “Node B”, “B node” or the like. The base stations may also be base stations of different classes, e.g. macro eNodeBs, home eNodeBs or pico base stations, also based on the transmission power and thus the cell size. A cell is a geographic area where radio coverage is provided by a base station at a base station site. One base station located at a base station site may serve one or more cells. Further, each base station may support one or more communication technologies. A base station communicates with devices within range of the base station via a radio interface operating at radio frequencies.

  In some RANs, multiple base stations are connected to each other, eg, by landline or microwave, or connected to a radio network controller such as a Universal Mobile Telecommunication System (UMTS) Radio Network Controller (RNC) Or both. A radio network controller, sometimes referred to as a base station controller (BSC) in GSM, for example, may manage and coordinate various operations of a plurality of connected base stations. GSM is an abbreviation for Global System for Mobile Communications (originally Groupe Special Mobile).

  In the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), base stations, which may also be referred to as eNodeBs or even eNBs, may be directly connected to one or more core networks.

  UMTS is a third generation mobile communication system evolved from GSM and is intended to provide improved mobile communication services based on Wideband Code Division Multiple Access (WCDMA) access technology. The UMTS Terrestrial Radio Access Network (UTRAN) is essentially a radio access network using wideband code division multiple access for devices. 3GPP is working to further develop UTRAN and GSM based radio access network technology.

  According to the 3GPP GSM EDGE Radio Access Network (GERAN), the device has a multi-slot class that determines the maximum transmission rate in the uplink and downlink directions. EDGE is an abbreviation for Enhanced Data rates for GSM Evolution. At the end of 2008, the first release of the 3GPP Long Term Evolution (LTE) standard, Release 8, was finalized and subsequent releases were finalized.

  Recent developments of 3GPP LTE facilitate access to local Internet Protocol (IP) based services in home, office, public hotspot or even outdoor environments. One important use case for local IP access and local connectivity is as follows: (typically less than a few tens of meters, but up to hundreds of meters) direct between devices in close proximity Communication is included.

  In network-controlled so-called device-to-device (D2D) communication, a network such as a radio access network allows devices in close proximity to each other to discover each other in a process called device discovery and to base It helps to establish a direct link called D2D bearer establishment, not a link through a station. In fact, when two devices communicate with each other via a cellular base station, the communication path, as opposed to a single-hop direct D2D link, includes uplink hops and downlink hops that include resources associated with both. Including. In the context of the present disclosure, the expression downlink (DL) is used for the transmission path from the base station to the mobile station or device. The expression uplink (UL) is used for the reverse (ie, mobile station or communication device to base station) transmission path.

  The establishment of the D2D link is initiated either by the radio access network or by the devices of the D2D pair. In establishing a network initiated D2D link, the network recognizes that two devices in communication are in close proximity to one another. In establishing a device initiated D2D link, the devices, like Bluetooth, discover that they are close together, as well as discover some of the functions needed to establish a D2D link.

  In network controlled D2D communication, the network control function may: a) provide a discovery signal used to determine their proximity and / or D2D link estimation between two devices, b) D2D discovery signal and / or Or allocation of resources for the D2D data channel and / or D2D control channel, c) relaying information between at least two devices, d) connection parameters for at least two devices of the D2D link (eg actual, minimum Power settings such as maximum coding scheme and modulation scheme, transfer block size for encryption / integrity protection, segmentation settings such as parameters and / or security keys, and settings of protocol parameters) Run one.

  Transmission in LTE or Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is based on Orthogonal Frequency Division Multiplexing (OFDM), and the format of OFDM is modeled as an OFDM time-frequency grid. An OFDM time-frequency grid is included on one axis of frequency values and the other axis of time. The frequency axis is subdivided into a number of frequency subcarriers, which may typically have a spacing corresponding to 15 kHz, and the time axis is subdivided at intervals of OFDM symbols.

  In the grid, a physical resource block (PRB or RB) is a unit of transmission resources composed of 12 consecutive subcarriers in the frequency domain and one time slot (0.5 ms) in the time domain.

  The direct communication mode, ie D2D communication, is in contrast to conventional cellular technology since the D2D devices are very close to each other as compared to the cellular devices which must communicate via cellular access points such as base stations. Enables a number of potential gains, such as:

Capacity gain: First, radio resources such as OFDM RB between D2D and cellular layer can be reused, ie reuse gain. Second, in contrast to two-hop links via cellular access points, D2D links use a single hop between transmitter and receiver points, ie, hop gain.
Peak rate gain: Due to proximity and potentially favorable propagation conditions, higher order modulation and coding schemes (MCS) can be applied, which can further increase the maximum achievable data rate That is, proximity gain.
Delay time gain: If the device communicates via a direct link, base station transfers may be shortcutd and end-to-end delay may be reduced.

  In a mixed cellular and D2D network, which results from the coexistence of two systems of cellular and D2D networks, the physical layer (PHY) channel design is an interference between the systems (ie, between the cellular subsystem and the D2D subsystem). Interference) must be considered. The coexistence of the system results in two types of interference: 1) interference of the same channel or RB (ie interference on the same RB) and 2) inter-channel or due to in-band emission Inter-RB interference (ie, interference from allocated RBs to un-allocated RBs in the band) may occur. Here, the band may be defined as a continuous frequency range (multiple bands defined by 3GPP in 3GPP TS 36.101, EUTRA User Equipment (UE) radio transmission and reception, 2012.03), and the corresponding carrier frequency is the frequency It is a specific frequency used to carry radio signals that span the entire band.

  In-band emissions (ie, unassigned from in-band allocated RBs) as shown in the following table defined by 3GPP (3GPP TS 36.101, EUTRA User Equipment (UE) radio transmission and reception, 2012.03) Interference to the RB), depending on the system bandwidth, the size of the allocated RB, the error vector magnitude (EVM), the specific values for the transmit power etc, to different levels for different cases Limited First, in the general case, ie the measured bandwidth is 1 RB and the limit is the measured power in one unallocated RB against the average power measured per allocated RB Where averaging is performed over all assigned RBs. Second, in the case of the image frequency (image frequency), i.e. the inversion of the allocated bandwidth based on the symmetry of the frequency applicable to this limit with respect to the central carrier frequency. If it is included but excludes all assigned RBs. Third, the case of carrier frequency leakage, ie, frequencies applicable to this limit, are included in RBs containing DC frequencies or RBs adjacent to DC frequencies, but excluding any RBs that have been allocated. If it is

Here, N _RB is defined as transmission bandwidth setting and is expressed in resource block units, L _CRBs is defined as a length of adjacent resource block allocation, and | Δ _RB | is an allocated RB. And P _RB is defined as the transmit power measured in dBm every 180 kHz in the allocated RB. A simple calculation may be as follows. For a general item, given a bandwidth of 5 MHz, 5 RBs assigned to the cellular device with transmit signaling EVM = 0.175, and Tx power = 23 dBm, the in-band radiation is I = I It becomes max [-32, -18-x, -57]. Where x is the starting frequency offset between the allocated RB and the measured unallocated RB, eg, x = 0 for the first adjacent RB outside the allocated bandwidth For two adjacent RBs, x = 1, ie radiation from -18 to -32 dB results. This radiation is more severe for the larger size for the allocated RB, the RB closest to the allocated RB, the larger EVM. As shown in FIG. 1, nearby cellular devices, such as 10 m, cause impairments in D2D communication in adjacent bands, even when -30 dB radiation is assumed. According to the path loss model of IMT-A (International Mobile Telecommunications-Advanced) Indoor Line-Of-Sight (NLOS): 43.33 * log 10 (10 m) + 11.5 + 20 * log 10 (2 GHz) = 60.82 dB.

  Thus, co-channel and / or inter-channel interference is a problem in mixed wireless networks.

  Accordingly, it is an object of embodiments herein to provide a method to improve performance in mixed cellular / D2D wireless networks.

  According to a first aspect of the embodiments, the object is achieved by a method in a network node for multiplexing physical channels between the network node and a device. Network nodes and devices are included in the mixed wireless network. The mixed radio network further includes a cellular network including one or more cellular channels and a D2D network including one or more device to device (D2D) channels. The network node time division multiplexes the physical channels between the first group of cellular channels and the first group of D2D channels. The network node frequency division multiplexes the physical channels between the second group of cellular channels and the first group of D2D channels.

  According to a second aspect of the embodiments, the object is achieved by a network node for multiplexing physical channels between the network node and a device. Network nodes and devices are included in the mixed wireless network. The mixed radio network further includes a cellular network including one or more cellular channels and a D2D network including one or more device to device (D2D) channels. The network node time division multiplexes the physical channels between the first group of cellular channels and the first group of D2D channels, and between the second group of cellular channels and the first group of D2D channels. And processing circuitry for frequency division multiplexing the physical channel.

  Because physical channels are multiplexed, co-channel and inter-channel interference between cellular and D2D channels is avoided or mitigated. Performance is thereby improved.

  An advantage of the embodiments herein is to provide a simplified PHY channel design to avoid or mitigate co-channel and inter-channel interference between cellular and D2D channels.

  A further advantage according to the embodiments herein is the PHY channel design that avoids or mitigates co-channel and inter-channel interference between cellular and D2D channels, and also maximizes use of radio resources It is.

  A further advantage of the embodiments herein is the provision of backwards compatibility with current 3GPP LTE specifications for cellular systems for HARQ timing.

  Another further advantage according to the embodiments herein is the simple and flexible implementation of a network to control the ratio of cellular devices to D2D devices.

  Examples of embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram illustrating the effect of in-band radiation. FIG. 2 is a schematic block diagram illustrating an embodiment in a wireless communication system. FIG. 3 is a flow chart illustrating an embodiment of a method in a network node. FIG. 4 is a schematic diagram showing an embodiment of a frame structure of UL dedicated subframes for cellular and UL subframes corresponding to D2D. FIG. 5 is a graph showing 3GPP requirements for in-band emissions. FIG. 6 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 7 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 8 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 9 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 10 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 11 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 12 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 13 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 14 is a schematic diagram illustrating an embodiment of PHY channel design. FIG. 15 is a schematic diagram illustrating an embodiment of D2D HARQ timing. FIG. 16 is a schematic block diagram illustrating an embodiment of a network node.

  FIG. 2 shows a mixed wireless network 100 in which the embodiments herein may be implemented. The mixed wireless network 100 may be LTE, WCDMA (Wideband Code Division Multiple Access), GSM (Global System for Mobile Communications) network, any 3GPP cellular network, any 3GPP2 cellular network, WiMAX (Worldwide Interoperability for Microwave Access) network, WiFi network, Alternatively, it is a wireless communication network such as any wireless network or wireless system.

  Mixed wireless network 100 includes cellular networks and D2D networks.

  Mixed wireless network 100 includes network node 110. The network node 110 may, for example, be able to service devices or machine type communication devices in an eNB, eNodeB or home Node B, home eNode B, femto base station, BS, pico BS or mixed radio network 100 Base stations such as all network units. In some particular embodiments, network node 110 is a device such as a stationary relay node, a mobile relay node, or a user equipment. The mixed wireless network 100 covers geographical areas divided into cell areas. Each cell area may be serviced by a network node, and one network node may service one or more cells. In the example shown in FIG. 2, network node 110 is a base station, serving cell 115. The network nodes 110 may be different classes of network nodes, eg macro eNodeBs, home eNodeBs or pico base stations, also based on the transmission power and hence the cell size. Typically, mixed wireless network 100 may include more cells similar to 115 that are serviced by respective network nodes. This is not shown in FIG. 2 for the sake of simplicity. Network node 110 supports one or more communication technologies, the names of which depend on the technology and terminology used. In 3GPP LTE, network nodes, also referred to as eNodeBs or even eNBs, may be directly connected to one or more core networks.

  The mixed wireless network 100 further includes at least a first device 121, a second device 122, and a third device 123 located in the cell 115. Any of the first device 121, the second device 122 or the third device 123 is a wireless communication device such as, for example, a mobile terminal, a wireless terminal and / or a UE also known as a mobile station. The device is wireless, i.e. the device can communicate wirelessly in a wireless network, sometimes also referred to as a cellular radio system or cellular network. The communication may occur, for example, between two devices, between a device and a regular telephone, and / or between a device and a server. Communication may occur, for example, via a RAN and possibly one or more core networks included in a wireless network.

  Devices 121, 122 and 123 may be further referred to as cell phones, cellular phones, or laptops with wireless capabilities, to name a few other examples. For example, the devices 121, 122 and 123 in the context of the present description may be portable, pocketable, hand-held, computer-embedded or automotive capable of communicating voice and / or data with other entities via RAN. Other entities may be, for example, servers, laptops, personal digital assistants (PDAs), tablet computers sometimes referred to as surfplates with wireless capabilities, machine-to-machine (M2M) Device, a device equipped with a wireless interface such as a printer or a file storage device, or any other wireless network unit that can communicate via a D2D link and via a wireless link in a cellular communication system. In some embodiments, devices 121, 122 and 123 may be further referred to as network nodes.

  In some embodiments where the first device 121 is included in a cellular network and the first device 121 is not the network node 110, the first device 121 is in a cell 115 serviced by the network node 110. If present, they are configured to communicate within the mixed wireless network 100 via the wireless link 131 and via the network node 110.

  In this example, the second device 122 and the third device 123 are also located in the cell 115. However, in other embodiments, the second device 122 and / or the third device 123 may be located in other cells near the cell 115, but within radio range of each other. The second device 122 and the third device 123 may be connected via a wireless link (eg, the second device 122) if the service is in the neighboring cell by the cell 115 serviced by the network node 110 or another network node. In some embodiments where the network node 110 is not the network node 110 and in some embodiments where the third device 123 is not the network node 110), the network node 110 or a neighboring cell It is configured to communicate within the mixed wireless network 100 via other serving network nodes. The second device 122 and the third device 123 can further communicate with each other, eg, via the D2D link 140, or with other devices using wireless D2D communication, and are included in the D2D network.

  Each of the devices 121, 122 and 123 is configured to communicate using either or both cellular and D2D communication. However, for purposes of explanation, in the following discussion, the first wireless device 121 is understood to use cellular communication, and the second wireless device 122 and the third wireless device 123 use D2D communication. Be understood.

  As described above, in the mixed cellular / D2D wireless network 100, the coexistence of the cellular system and the D2D system in the same network causes an inter-system interference problem. D2D communication can typically be deployed on cellular UL resources characterized by less traffic.

  In some embodiments, D2D functionality is considered to be implemented based on the 3GPP frequency division duplex (FDD) and time division duplex (TDD) LTE frameworks. As mentioned above, considering the PHY channel structure in the LTE system described in the background section, the coexistence of cellular and D2D systems in the same mixed radio network 100 results in two types of interference, 1) identical RB interference (ie, interference on the same RB) and 2) inter-RB interference due to in-band radiation (ie, interference in the time dimension from allocated RB to in-band RB) , May occur.

  Thus, there is a need for a way to overcome the interference problems present in mixed wireless network 100 so that cellular and D2D communication can take place without too much interference. The embodiments herein aim to overcome this interference problem by designing PHY channels for mixed networks so as to minimize or avoid co-channel and / or inter-channel interference. I assume.

  In principle, and in order to solve the problem of interference of the same RB (ie interference on the same RB), the network node 110 pre-confides the device to measure the interference and Based on the measurement report of, the device is scheduled accordingly to avoid the collision between cellular transmission and D2D reception. However, some of the cellular channels such as the cellular channel quality indicator (CQI) and the dedicated scheduling request (D-SR) physical uplink control channel (PUCCH) channel are pre-scheduled with fixed timing and resource allocation (ie, While being statically preset), the user wants to establish D2D communication at any time. If D2D communication can be done on an as-needed basis, ie on any radio resource, D2D communication may collide with transmissions statically preset by the network and cellular transmissions typically transmitted at higher power And may interfere with D2D communication, which is typically transmitted at lower power. Thus, the network node 110 needs to take this into account to avoid interference. The same scheduling may not apply to all channels. The scheduling is tailored to the transmission characteristics of all channels, such as resource allocation and transmission power adjustment. For example, a device located at the center of the cell 115 is located at an off center of the cell 115 and is transmitting at a lower power as compared to a device that may cause more interference, Hence it does not cause significant interference. Transmissions from devices located far away from other devices are also received by the devices at lower power than transmissions from devices that are adjacent and may also cause greater interference. Thus, as described below, network node 110 takes into account these various transmit / receive characteristics when scheduling various devices in cell 115.

  An embodiment of a method in the network node 110 for multiplexing physical channels between the network node 110 and the devices 121, 122, 123 will now be described with reference to the flow chart shown in FIG. As described above, the network node 110 and the devices 121, 122 and 123 are included in the mixed wireless network 100. Mixed radio network 100 includes a cellular network that includes one or more cellular channels, and a D2D network includes one or more D2D channels. The network node 110 comprises a base station, a stationary relay node, a mobile relay node, a first device 121, a second device 122, a third device 123, and a first device 121, a second device 122 and a third One of the wireless devices other than the device 123.

  The method includes the following operations, which may be performed in an appropriate order other than the order described below. In some embodiments, all operations may be performed, while in other embodiments only some operations may be performed.

<Operation 301>
In order to handle the interference problem of the mixed wireless network 100, in this operation, the network node 110 addresses the problem of statically preset channels. Due to the fact that the interference caused by these channels age, managing the interference of these channels according to their scheduling requires repeated reconfiguration and hence high signaling overhead. In order to avoid this reconfiguration repetition and hence to eliminate reconfiguration signaling overhead, the network node 110 schedules some of the cellular channels and some of the D2D channels at different times, They do not transmit at the same time and do not interfere with each other. Thus, in this operation, the network node 110 time-divides in the physical channel between the first group of cellular channels and the first group of D2D channels to avoid uncontrollable channel-to-channel interference. Perform multiplexing. This is implemented jointly by downlink control signaling from the network node 110 (e.g. by DCI (downlink control indicator), MAC CE (media access control layer control element) and RRC (radio resource control) signaling) Ru. In some embodiments, the first group of cellular channels may include one or more cellular channels that are pre-scheduled at fixed timing and resource locations. In some specific embodiments, the first group of cellular channels includes PUCCH D-SR / CQI channels, and the first group of D2D channels includes D2D control channel (DCCH) and D2D shared channel (DSCH). May be included. In some specific embodiments, the first group of cellular channels 411, 412 may further include PUCCH acknowledgment / negative acknowledgment (A / N) channels.

  The DCCH is used by the D2D pair in a manner similar to the cellular PUCCH used to carry hybrid automatic repeat request (HARQ) acknowledgment / negative acknowledgment (A / N) feedback, and the existing format of PUCCH design May be reused by the DCCH. DSCH is a cellular physical uplink shared channel (PUSCH) used to carry D2D data transmission, HARQ A / N in-band control signaling and buffer status reporting (BSR) power headroom (PHR), etc. Used by D2D in a manner similar to.

  Time division multiplexing between the first group of cellular channels and the first group of D2D channels to avoid inter-channel interference results in two types of UL subframes (ie, cellular-only sub-frames). A frame and D2D and cellular corresponding subframes are obtained. This is illustrated in the particular embodiment of FIG. 4, which shows physical channel 400, cellular only subframe 401, D2D and cellular enabled subframe 402, the first group of cellular channels 411, 412, cellular The second group of channels 421 as well as the first group of D2D channels 431, 432 are shown. Physical channel 400 is between the first group of cellular channels 411, 412 associated with cellular dedicated subframes 401 and the first group of D2D channels 431, 432 associated with D2D and cellular enabled subframes 402. Division multiplexing is performed. As illustrated, in the embodiment of FIG. 4, the first group of cellular channels 411, 412 includes cellular PUCCH D-SR / CQI, PUCCH A / N and PUSCH, and a second group of cellular channels 421. , Includes PUCCH A / N, and the first group of D2D channels 431, 432 includes DCCH and DSCH. Hereinafter, FIG. 4 will be further described.

  Time division multiplexing between a first group of cellular channels and a first group of D2D channels is a method for overcoming the problem of in-band emission from statically preset cellular transmission to D2D communication I will provide a.

<Operation 302>
For other channels that are not statically preset, eg, cellular PUCCH A / N, network node 110 relies on dynamic scheduling of channels in mixed radio network 100, such as DL physical downlink shared channel (PDSCH) Adjust the interference. This is a fixed timing and resource location mapping relationship between PDSCH and PUCCH uplink transmission for ACK / NACK feedback (ie, 4 ms after PDSCH at a specific resource location calculated based on PDSCH scheduling Because there is). Thus, a way to avoid interference from PUCCH (i.e. ACK / NACK feedback) may be to limit downlink data transmission on PDSCH. Compared to CQI D-SR, it is practically impossible to achieve time division multiplexing with PUCCH A / N since HARQ A / N is triggered by PDSCH in all DL subframes. For these channels, the network nodes 110 do not interfere by transmitting on each other's frequency by scheduling some of the cellular channels and some of the D2D channels on different frequency ranges Make it

  Thus, in this operation, the network node 110 controls the resource allocation of both the cellular uplink transmission and the D2D data transmission so that the second group of cellular channels 421 and the D2D channels 431, 432 in the physical channel 400. Further perform frequency division multiplexing with the first group of In some embodiments, the second group of cellular channels 421 may include one or more cellular channels, such as PUCCH A / N channels, that rely on signaling of other cellular channels. The first group of D2D channels 431, 432 is identical to that described above.

  As mentioned above, in some embodiments, as a result of the above-described time division multiplexing operation and frequency division multiplexing operation, two types of subframes, namely, cellular dedicated subframe 401, D2D and cellular enabled subframe 402 And physical channels are obtained. The cellular dedicated subframes 401 are associated with the first group of cellular channels 411, 412, and the D2D and cellular enabled subframes 402 with the second group of cellular channels 421 and the first group of D2D channels 431, 432. It is associated. In some embodiments as shown in FIG. 4, the cellular dedicated subframes 401 are conventional cellular UL subframes that may include frequency division multiplexed cellular PUCCH and PUSCH, and D2D and cellular enabled subframes 402 may include cellular PUCCH A / N and D2D DCCH and DSCH.

  The goal is to achieve high spectral efficiency from reuse by allocating cellular devices such as the first device 121 in D2D and cellular enabled subframes 402. This scheme may allow for resource reuse on D2D and cellular enabled subframes 402. If this is not done, D2D communication may use resources in a dedicated way to avoid interference between systems. However, in these embodiments, the reuse gain is lower. In some specific embodiments, at least one of the first group of cellular channels 411, 412 and the second group of cellular channels 421 may further include a cellular PUSCH. However, in other embodiments, no cellular PUSCH may be present in D2D and cellular enabled subframes 402. In these latter embodiments, there may not be a cellular device that reuses resources in D2D communication.

<Operation 303>
In some embodiments, for each cellular device 121 assigned or already assigned to D2D and cellular enabled subframes 402, network node 110 may be assigned or already assigned each cellular device 121. Information regarding the interference of one or more active D2D devices 122, 123 in corresponding subframe 402 may be obtained. This may be done, for example, by pre-setting the measurement of the D2D device in the set of cellular reference signals (RS). If any cellular RS is identified as a major source of interference, it can be reported to the network.

  As mentioned above, the interference caused by the channel depends on the transmission power of the channel. The transmission power varies from device to device depending on the position of the device in the cell 115. For example, a device located at the cell center of the cell 115 may transmit at lower power as compared to a device located at an off-center portion of the cell 115 and causing more interference. Does not cause great interference. Devices located far away from other devices also do not cause significant interference as they may be received at lower power compared to devices that are adjacent and may cause more interference. Thus, network node 110 may take into account these various transmit / receive characteristics when scheduling various devices of cell 115 in D2D and cellular enabled subframes 402. Therefore, in order to solve the problem of in-band radiation, network node 110 needs to avoid scheduling D2D devices and nearby cellular devices not only in the same RB but in RBs adjacent to the same slot. sell. That is, the network node 110 schedules only cell-centric (ie low transmission power) cellular devices in the same slot. For higher cellular transmit power (up to 23 dBm for cellular devices), the interference level will be higher, even for far away neighboring RBs (eg, about -80 dBm as shown in FIG. 5) ). Thus, in other embodiments, network node 110 may rely on dynamic DL scheduling to avoid high power channels in D2D and cellular enabled subframes. For example, it may not be desirable for the device to send A / N feedback in the fifth UL subframe. The network node 110 can not control UL scheduling because the A / N timing and position are mapped to DL data on a one-to-one basis. However, the network node 110 can control DL scheduling, so that devices are not scheduled in the first DL subframe, and there are no devices scheduled in the fifth UL subframe, It can be forced. The network node 110 determines which interference level is within tolerance for D2D communication. This level will set a threshold above which the interference may be too high in D2D communication and hence network node 110 will schedule devices accordingly in D2D and cellular enabled subframes It may be necessary. This threshold is, for example, by A (ie target SINR (signal to interference and noise ratio) and B (ie realized D2D signal power) of D2D communication) and further C (ie inter-frequency loss factor of interference) It is determined as B * C / A by considering together.

  In some embodiments, for each cellular device, such as the first cellular device 121 assigned to D2D and cellular enabled subframes 402, all active D2D devices 122, 123 avoid co-channel or interference between channels In order to do so, it may be necessary to detect interference and send that information to the network node 110. In other embodiments, it may be the network node 110 itself to measure the inter-channel interference from the D2D devices 122,123. This may be performed by interference measurements by all active D2D devices 122, 123 in D2D and cellular enabled subframes 402, and thus interference between co-channels or channels out of tolerance (ie interference threshold The D2D device that detects the interference (above) may report to the network node 110. When considering in-band emissions, the safety level or threshold of this interference may be different due to the co-channel and the inter-channel interference, so that the interference report is harmful for co-channel interference while the inter-channel interference May indicate an acceptable range.

  Thus, in some embodiments, obtaining information regarding interference includes measuring interference and receiving information regarding interference from at least one of the D2D devices 122, 123. including. This may be achieved by presetting the radio resource management (RRM) measurement and reporting mechanism of the devices 122, 123 via RRC signaling. Then, as long as the trigger condition is satisfied (ie, a certain threshold is achieved, large path loss between the network node and the device, when the signal of the adjacent cell exceeds a certain level, etc.), the devices 122 and 123 measure The report may be sent to the network 110.

  In some embodiments, by analyzing when the PHR report from one of the cellular devices indicates that there is a certain threshold for room for device power increase, the network may be configured to transmit location or power. It is possible to recognize cellular devices and D2D devices that cause interference due to PHR is reported by the device to indicate the estimated power headroom (ie, the difference between the nominal device maximum transmit power in the current subframe and the estimated power for PUSCH transmission, expressed in dB) It is an index.

  In other embodiments, the potential interference of the device may be determined by a positioning method or a positioning method. Thus, in some embodiments, devices transmitting at powers below the first power threshold (e.g., cell-centric devices and devices far from the D2D devices 122, 123) may be global positioning system (e.g. They can be detected by reporting their position to the network node 110 by a positioning sensor such as GPS).

  In some embodiments, this / these measurements may be performed by D2D devices such as 122 and 123. Relying on GPS and PHR involves lower signaling overhead compared to measurement reporting. Thus, in some embodiments where network node 110 only wants to identify cell-centric devices (ie, a subset of low interference devices), network node 110 may rely solely on GPS and / or PHR.

<Operation 304>
Scheduling of cellular and D2D channels in D2D and cellular enabled subframes 402 can result in interference problems between RBs (ie, in-band) as described above in the background section, which is Due to the high power of the transmission of the cellular channel, which is assigned close to the frequency for low power transmission of the transmitting D2D channel. In order to overcome this problem between the high power allocation for the transmit cellular channel and the low power allocation for the transmit D2D channel in D2D and cellular enabled subframes 402, some degree of frequency separation (ie, margin) May be tolerated. That is, no particular frequency range is assigned to any channel.

  Thus, in some embodiments, the network node 110 may provide RB margin between the second group of cellular channels 421 and the first group of D2D channels 431, 432 to avoid in-band interference. The frequency margin 440 can be set. This may be achieved by controlling the resource allocation for both cellular uplink transmission and D2D data transmission. Thus, the network node 110 can, in two allocations, the second group of cellular channels 421 and the first group of D2D channels 431, 432 in order to avoid or reduce interference between frequencies. It may be scheduled with a sufficiently large margin in the middle of the group. The greater the intermediate margin, the less interference between the frequencies that the second group of cellular channels 421 and the first group of D2D channels 431, 432 may cause.

  In some embodiments, RB margin may be used to avoid interference from channels in the second group of cellular channels 421, such as PUCCH A / N.

  In some embodiments, for the example as shown in FIG. 4, the D2D DCCH can be configured to provide the largest RB margin 440 from the cellular PUCCH located in the outer segment of the subframe. It may be assigned to the center.

  Therefore, in order to avoid the interference between the channels allocated in the D2D and cellular subframes 402, the question arises as to how large the RB margin 440 is. As shown in FIG. 5, according to the 3GPP requirements for a 20 MHz LTE system, 0 dBm cellular UL bi-phase phase shift keying / quaternary phase shift keying (BPSK / QPSK) transmission is banded to adjacent RBs Internal interference may be limited to various levels, but maintaining a stable level from the seventh RB. Thus, the RB margin of 7 RBs can ensure that the in-band emission remains at -105 dBm, which is acceptable for D2D communication.

  Thus, in some embodiments, the RB margin 440 set between the channels of the D2D and cellular enabled subframes 402 may include seven or more RBs. In some particular embodiments, RB margin 440 may be seven RBs.

  In some embodiments, the setting of RB margin 440 may be dynamic based on interference avoidance. That is, the RB margin 440 may or may not be used based on whether the obtained interference is above or below the above mentioned interference threshold. In other words, if inter-RB interference is measured as acceptable (eg, -105 dBm) even for the closest RBs, such RB margin 440 may not be necessary. For example, in some embodiments, the locations of the cellular PUSCH and D2D DSCH may be dynamically determined by the network node 110 considering interference avoidance, ie, they are not necessarily separated by the RB margin 440. Good. Thus, in some embodiments, setting of frequency margin 440 may be performed if the obtained information regarding interference exceeds an interference threshold.

<Operation 305>
As mentioned above, in some embodiments, it may be necessary to measure co-channel and inter-channel interference in order to perform scheduling and resource reuse in D2D and cellular enabled subframes 402.

  In embodiments where network node 110 obtains interference information, joint scheduling (ie pairing) of secure cellular devices such as first device 121 and D2D devices 122 and 123 may be performed by D2D devices 122 and 123 or network node 110. The interference report from itself may continue until it indicates that the interference is out of tolerance (ie above the interference threshold), for example due to the mobility of the device. Thereafter, the interfering cellular devices or interfering D2D devices may leave the joint scheduling group and be scheduled in the cellular dedicated subframe 401 or D2D and the cellular enabled subframe 402.

Thus, one way to overcome the problem of in-band interference is to limit the allocation of cellular devices such as the first device 121 in D2D and cellular enabled subframes 402 based on the transmit power. For example, only cell-centric devices (ie, devices with low transmit power) may be allowed at their respective locations in D2D and cellular corresponding subframes 402.

In these embodiments, there may be RB margins 440 as described above, for example, between the cellular PUCCH and the D2D DSCH and / or DCCH. Another option is that the cellular devices that are far away from the D2D device (i.e. may be cell edges) and path loss / interference measurement with GPS assistance or D2D devices etc can be implemented in the corresponding DL subframes Can be scheduled at In these embodiments, there may be a smaller RB margin 440 or no RB margin 440.

  The first option may be easier to realize than the second option, as the second option relies on measurements of D2D devices that may cause more signaling overhead. However, as a result, due to the use of RB margin 440, it may limit the use of D2D RB to some extent for transmission. Both options may depend on the scheduling implementation and may change over time. In some embodiments where measurement of D2D will cause the cellular PUSCH to be detected as causing interference within tolerance, it can be placed in the space of RB margin 440 and still all RBs can be used .

  In this operation and based on the above description, in some embodiments where the D2D and cellular enabled subframes 402 have a position for the second group of cellular channels 421, the network node 110 may use the second of the cellular channels 421. Only the cellular device 121 transmitting below the first power threshold at the location for the group of. The first power threshold is a threshold below which the induced interference is within tolerance by measurement of D2D (ie below the above mentioned interference threshold).

  In another embodiment, since the timing relationship between the DL PDSCH and the UL HARQ A / N is fixed in the current 3GPP LTE system, the network node 110 performs corresponding high power A / N in D2D and cellular enabled subframes. Rely on dynamic DL scheduling to avoid. Thus, network node 110 needs to avoid this fixed relationship and schedule the remaining channels according to the potential interference.

  In some specific embodiments, in D2D and cellular enabled subframes 402, a cell-centric device (A) to avoid harmful interference from PUCCH A / N to frequency division multiplexed D2D DCCH / DSCH That is, only low transmit power cellular devices may be scheduled at corresponding DL PDSCH locations.

  Thus, in some embodiments, the network node 110 may dynamically determine the positions in the physical channel of the cellular and D2D channels based on interference avoidance. That is, the cellular channel and the D2D are such that the network node 110 is based on the acquired information on the interference such that the acquired information on the interference is within the determined interference threshold, such as the above mentioned interference threshold. The frequency and / or time interval (i.e., position) in the D2D and cellular corresponding subframes 402 of the channel may be determined dynamically. For example, if the interference from the PUCCH at the band edge is high, the network node 110 may need to allocate a D2D channel at the center of the band, with some frequency margin in between to mitigate the interference. Otherwise, no resource margin would be needed. As another example, if there are already multiple D2D devices using different resources for PUSCH cellular data transmission, the network node 110 may allow the cellular PUSCH to re-use resources by the D2D device, but One should choose a D2D device that does not cause harmful interference by the cellular device. In some specific embodiments, the cellular channel whose frequency and / or time interval in the D2D and cellular corresponding subframe 402 may be dynamically determined may be a PUSCH channel, and the D2D channel is a DSCH channel. May be Dynamic decisions are made to avoid interference, the trigger of which is an interference relationship, whose information depends on the measurement report from the D2D devices 122, 123 in some embodiments by the network It is acquired.

  In embodiments where the DCCH is located at the center of the band, it may pose a problem for localized scheduling of cellular UL transmissions, which may be originally designed for continuous RB allocation. However, considering an embodiment using Release 10 LTE, where multi-cluster PUSCH transmissions for cellular device 121 are allowed (ie, cellular UL transmissions do not need to be performed on consecutive RBs), band-centric D2D DCCH can hardly pose a problem for scheduling.

  In the absence of inter-system interference information, the most robust method to overcome the problem of interference is to place cellular transmissions in cellular-only subframe 401 and not use cellular PUSCH but RB margin from PUCCH At 440, a method for placing D2D transmissions in D2D and cellular enabled subframes 402.

  As mentioned above in the preceding operation, in some embodiments, from D2D and Cellular-enabled subframes, D2D DCCH / DSCH frequency-division multiplexed from some high power of transmission channels such as PUCCH A / N. Only cell-centric cellular devices may be scheduled at corresponding DL PDSCH locations to avoid harmful interference to lower power of the transmission channel, etc. In some embodiments, the corresponding DL PDSCH locations in the cellular dedicated UL subframes are not assigned D2D channels, and there is no need to consider avoiding interference between systems, so the corresponding DL PDSCH Locations may not require scheduling restrictions.

  Thus, in some embodiments, the scheduling for cellular device 121 in cellular only subframe 401 by network node 110 may not be restricted.

  The above discussion focuses on the description of UL subframes, where typically D2D channels are allocated. Similar scheduling operations may be performed in the DL subframe by the network node 110, but are omitted herein for the sake of simplicity.

  The implementation of FIG. 6 in mixed wireless network 100 to avoid interference to lower power of transmitted D2D communication from high power transmissions such as PUCCH A / N cellular channels and as a result of operations 301-305 described above. A subframe mapping relationship between DL subframe type and UL subframe type may occur as shown in the form. This mapping, which may be between data transmission on PDSCH and ACK / NACK feedback on PUCCH, is a fixed timing / position mapping according to 3GPP specifications. In FIG. 6, the cellular only DL / UL subframe 401 is shown in black and no restriction of cellular devices is required. The D2D and cellular compliant DL / UL subframes 402 are shown in white, and only cell-centric cellular devices / faraway cellular devices may be scheduled in the DL subframes. Cellular devices that cause / do not cause interference between co-channels / channels within tolerance may be scheduled in UL subframes in the FDD LTE system. In FDD systems, the transmitter and receiver operate on different carrier frequencies. The patterned subframes are cellular only subframes 401 or D2D and cellular enabled subframes 402, depending on the traffic, in operations 306 and 307, as described below. For TDD systems, the subframe pattern design also needs to take into account the TDD configuration of the system, since the DL and UL resources are on the same carrier frequency.

  In some embodiments, the interference measurement between the same RB / RB as described in operation 303 may continue during a data transmission procedure where information on the reference signal (RS) settings of the cellular device may be needed. This information is sent by the network node 110 to the D2D devices 122, 123 in order to measure a particular RS, as a result of which cellular devices giving harmful interference are identified, which are later determined by the D2D devices It may be reported to the network node 110. In some embodiments, this interference measurement / reporting may be performed on cellular devices between RBs, not on cellular devices of the same RB, so taking into account the full dynamic scheduling of cellular devices Can cause signaling overhead. Although interference of the same RB affects cellular devices 121 reusing the same resources, in the case of interference between RBs, it is necessary to monitor all cellular devices 121 on the same time slot, which means that Represents an increment of signaling overhead. Thus, in some embodiments, semi-persistent scheduling of cellular devices 121 on D2D and cellular enabled subframes 402 may be employed to reduce signaling overhead (ie, cellular RS information may be transmitted in the data transmission procedure). It can not change much during the period). Semi-permanent scheduling may be defined as a semi-static scheduling scheme (ie, scheduling of resources may be repeated periodically on the same resource set).

<Operation 306>
In this operation, the network node 110 repeatedly locates the cellular dedicated subframes 401 and the D2D and cellular enabled subframes 402 in the physical channel 400 with specific resource periodicity. For example, it is repeated every 8 ms to coexist with the conventional FDD cellular HARQ process. All these depend on the corresponding scheduler implementation, ie the time when the devices 121, 122, 123 receive the resource grant.

  In some embodiments, the network node 110 repeatedly locates the cellular only subframe 401 and the D2D and cellular enabled subframe 402 in the physical channel 400 with a timing pattern based on HARQ timing of the cellular network.

  One factor to consider when designing PHY channel 400 in mixed radio network 100 is the timing of cellular system HARQ for both FDD and time division duplex (TDD) systems. HARQ is a simultaneous combination of automatic retransmission request (ARQ) and forward error correction (FEC). With HARQ, it is possible to adapt the error correction overhead dynamically, depending on the channel quality. When HARQ is used, retransmission is not required if the error is correctable by FEC, and retransmission is required if the error is detectable but not correctable. TDD is an application of time division multiplexing to separate outgoing and return signals. Compared to FDD systems where HARQ timing is more simplified, HARQ timing in TDD systems is specific to TDD configuration and hence more complex.

  According to the current 3GPP FDD LTE specification, UL HARQ is implemented synchronously, ie, in the FDD system, the new UL transmission in the nth transmission time interval (TTI) is DL in the n + 4th subframe May be ACK / NACK, which may cause retransmission in the (n + 8) th subframe. Thus, if the assignment of cellular dedicated subframe 401 and D2D and cellular enabled subframe 402 is designed for backward compatibility with cellular system HARQ timing for both FDD and TDD systems, the cellular dedicated sub The frame may be repeated every at least eight subframes. Considering this repeating pattern for every n + 8th subframe, as dictated by the current 3GPP FDD LTE specification, the network node 110 remains intermediate between the 1st subframe and the n + 8th subframe. Dynamically schedule 7 subframes of For this reason, as shown in FIGS. 6-8, the repeating pattern of cellular-only subframes every 8, 4 or 2 subframes is appropriate, and in FIGS. The relationship between HARQ indicator channel (PHICH) -PUSCH and the timing relationship of PUSCH-PHICH are shown, which are similar for FIGS. And, D2D system HARQ timing may be adapted to different repetition factors.

  As shown in the embodiment of FIG. 6, a repetition factor of every four subframes can be associated with many advantages and many drawbacks.

  An advantage of the 4 repetition factor is that D2D can achieve similar HARQ timing, as shown in FIG. That is, the new transmission in the nth TTI is fed back by A / N in the n + 4th subframe on the DCCH, and possibly followed by a retransmission in the n + 8th subframe. In other words, each of the n-th D2D and cellular subframes is A / N for the n + 4th subframe, new transmission in the n-th subframe, and retransmission for the n + 8th subframe. including.

  The disadvantage of the 4 repetition factor is that for cellular systems, the PUCCH periodicity can only be set as 4x subframes (eg 20 ms), but this is not the case for the 3GPP Rel-11 eDDA WI According to consideration of the above, it is within the allowable range for D-SR. The smaller D-SR periodicity is beneficial for networks that continue to be updated as appropriate for DL channel quality, as compared to a repetition factor of 8 where the D-SR periodicity is at least only 40 ms.

  In embodiments where the repetition factor is every 8 subframes, as shown in FIG. 7, D2D must implement extended HARQ timing, ie, the nth subframe is the n + 8th , And retransmissions may be further extended to the (n + 16) th subframe. In other words, the number of HARQ processes may be extended. These embodiments can be associated with many advantages and many disadvantages.

  An advantage of the eight repetition factor is that this option further improves the flexibility of cellular / D2D radio control. That is, the network node 110 dynamically assigns 7 to cellular dedicated subframes or D2D and cellular enabled subframes as opposed to 3 frames available with a repetition factor of 4 It can have a frame.

  As mentioned above, the drawback of the 8 repetition factor is that the larger PUCCH periodicity of 8x subframes may need to be used (eg 40 ms), but this is not the case with 3GPP Rel-11. According to the ongoing review of the eDDA WI, it is within the acceptable range for D-SR.

  In embodiments where the repetition factor is every 2 subframes, conventional HARQ timing is also realized by D2D, as shown in FIG. These embodiments are associated with many advantages and many disadvantages.

  The advantage of a repetition factor of 2 is that it can provide more options if n is an integer, which is a set PUCCH D-SR periodicity (i.e. in the number 2n). Nearly all existing D-SR periodicity options in existing LTE networks may be applied herein, as compared to four or eight repetition factors whose periodicity may be somewhat limited.

  The disadvantage of the two repetition factor is that the ratio of the cellular only subframe 401 to the D2D and cellular corresponding subframe 402 can be fixed at 1: 1. That is, the network node 110 is configured to use a cellular dedicated subframe 401 or D2D and a cellular enabled subframe as opposed to three frames available at a repetition factor of four and seven frames available for a repetition factor of eight. There may not be any frames to dynamically assign to 402.

  9 for TDD Configuration 0, FIG. 10 for TDD Configuration 1, FIG. 11 for TDD Configuration 2, FIG. 12 for TDD Configuration 3, FIG. 13 for TDD Configuration 4 and FIG. 14 for TDD Configuration 6. Similar designs can be extended to TDD systems as well. The different settings are for different forward link and reverse link resource ratios, and considering that D2D communication may be bi-directional transmission, resource ratios are adjusted according to traffic type and channel quality together May be

  Similarly, the flexibility of the resulting ratio control and the functionality of HARQ timing are different for different TDD configurations. In addition, for subframe 3 and subframe 8 in TDD configuration 0, there is a DL PDSCH associated with the PUCCH A / N field mainly due to the smaller number of DL subframes in this configuration. Because it is not, it would be more beneficial to place the D2D DCCH at the band edge without considering the interference from the PUCCH. Also, for TDD configuration 5, it may be difficult to guarantee backward compatibility as only one HARQ process may be granted in the UL, and a single between the cellular subsystem and the D2D subsystem There may not be much need to further partition the HARQ process of D.D. and therefore the D2D and cellular subframes 402 can not co-exist in that configuration.

  In some embodiments, to maintain compatibility of the cellular device 121 with conventional HARQ timing, the network node 110 further further comprises: all subframes corresponding to the same HARQ process being cellular dedicated subframes In order not to be mixed with 401 and D2D and the cellular corresponding subframe 402, a plurality of subframes of the same HARQ process may be one of the cellular dedicated subframe 401 and the D2D and the cellular corresponding subframe 402. Only one may be assigned together.

<Operation 307>
As the amount of traffic of cellular data and D2D data fluctuates in the mixed wireless network 100, the network node 110 depends on the amount of each traffic to make the cellular dedicated subframe 401, the D2D and the cellular enabled subframe 402 It may be necessary to allocate more or less. Referring to FIGS. 6-15, this depends on what degree of cellular and D2D transmission may be present, the network node 110 may use the subframes shown in the figure as cellular dedicated subframes 401. , D2D, and the cellular corresponding subframe 402 can be assigned.

  Thus, in this operation, in the time division multiplexing 301 and frequency division multiplexing 302, the network node 110 is based on the amount of resources required by cellular signaling and the amount of resources required by D2D signaling. The ratio of cellular dedicated subframes 401 to D2D and cellular enabled subframes 402 may be adapted dynamically. In some embodiments, such dynamic adaptation may be performed according to traffic type and / or channel quality. In some embodiments, traffic volume may provide information on the number of bits that need to be transmitted, while in some embodiments channel quality relates to the number of resources needed per bit. It can provide information. By combining the two, the network node 110 may be aware of the number of resources needed for both cellular and D2D communication, and hence how to divide the resources between the two. It can be decided. The type of traffic may be determined at the network node 110 by inspecting data packets using existing techniques of Deep Packet Inspection (DPI), or by a core network entity such as a PDN gateway It can be supported. Channel quality may be obtained from channel state information (CSI) reports from devices 121, 122, 123.

  In order to carry out the operations of the method in the network node 110 described above in connection with FIGS. 3, 4 and 6 to 15 for multiplexing the physical channel 400, the network node 110 is shown in FIG. It has the following configuration. As mentioned above, the network node 110 and the devices 121, 122, 123 are included in the mixed radio network 100, which comprises a cellular network including one or more cellular channels and one or more D2Ds. And a D2D network including a channel.

  The network node 110 time division multiplexes the physical channel 400 between the first group of cellular channels 411, 412 and the first group of D2D channels 431, 432, and a second group of cellular channels 421. And a first group of D2D channels 431 and 432, the multiplexing circuit 1601 configured to frequency division multiplex the physical channel 400.

  In some embodiments, physical channel 400 may include two types of subframes: cellular dedicated subframe 401 and D2D and cellular enabled subframe 402, which is the first of the cellular channels. The D2D and cellular capable subframe 402 is associated with the second group of cellular channels 421 and the first group of D2D channels 431, 432.

  In some embodiments, the first group of cellular channels 411, 412 may include cellular channels that are pre-scheduled with fixed timing and resource location, and the second group of cellular channels 421 is another cellular. It may include cellular channels that rely on channel signaling.

  In some embodiments, the first group of cellular channels 411, 412 may include cellular PUCCH D-SR / CQI channels, and the second group of cellular channels 421 may also include PUCCH A / N channels. Well, the first group of D2D channels 431, 432 may include DCCH and D2D DSCH.

  In some embodiments, at least one of the first group of cellular channels 411, 412 and the second group of cellular channels 421 may further include a cellular physical uplink shared channel (PUSCH).

  In some other embodiments, the first group of cellular channels 411, 412 may further include PUCCH A / N channels.

  In some embodiments, the network node 110 is configured with a configuration circuit 1602 configured to set a frequency margin 440 between the second group of cellular channels 421 and the first group of D2D channels 431, 432. It can further be equipped.

  In some of these embodiments, frequency margin 440 may include seven or more physical resource blocks.

  In some embodiments, devices 121, 122, 123 may include cellular devices 121 and D2D devices 122, 123, and network node 110 is assigned or already assigned to D2D and cellular enabled subframes 402. Configured to obtain, for each cellular device 121, information regarding the interference of one or more active D2D devices 122, 123 in the D2D and cellular enabled subframes 402 to which each cellular device 121 is assigned or already assigned. And an acquisition circuit 1603.

  In some of these embodiments, obtaining information related to interference includes measuring interference and receiving information related to interference from at least one of the D2D devices 122, 123. May contain one.

  In some embodiments, configuration circuit 1602 may be further configured to configure frequency margin 440 if the obtained information regarding interference exceeds an interference threshold.

  In some embodiments, the D2D and cellular enabled subframes 402 may have a position for the second group of cellular channels 421 and the network node 110 may be a position for the second group of cellular channels 421. The scheduling circuit 1604 may further comprise scheduling circuitry 1604 configured to schedule only cellular devices 121 transmitting below the first power threshold.

  In some embodiments, the network node 110 may further comprise positioning circuitry 1605 configured to repeatedly position the cellular only subframe 401 and the D2D and cellular enabled subframe 402 in the physical channel 400.

  In some of these embodiments, the positioning circuit 1605 further repeats the cellular dedicated subframe 401 and the D2D and cellular enabled subframe 402 in the physical channel 400 in a timing pattern based on the HARQ timing of the cellular network. It may be configured to position.

  In some embodiments, network node 110 may use the same HARQ process so that all subframes corresponding to the same HARQ process are either cellular dedicated subframes 401 and D2D and cellular enabled subframes 402. The assignment circuit 1606 may further comprise an assignment circuit 1606 configured to assign together a plurality of subframes of only one of the cellular dedicated subframes 401 and the D2D and cellular enabled subframes 402 together.

  In some embodiments, network node 110 is dedicated for cellular based on the amount of resources required by cellular signaling and the amount of resources required by D2D signaling in time division multiplexing and frequency division multiplexing. It may further comprise an adaptation circuit 1607 configured to dynamically adapt the ratio of subframes 401 to D2D and cellular enabled subframes 402.

  In some embodiments, the network node 110 determines whether the acquired information on interference is within the determined interference threshold, based on the acquired information on interference, of the cellular channel and the D2D channel, It may further comprise a decision circuit 1608 configured to dynamically determine the frequency and / or time interval in the D2D and cellular enabled subframes 402.

  In some embodiments, the network node 110 comprises a base station, a stationary relay node, a mobile relay node, a first device 121, a second device 122, a third device 123, and a first device 121, a second device. And one of the wireless devices other than the third device 123.

Scheduling circuit 1603 may be included in the scheduler. The scheduler may manage cellular communication of devices such as the first device 121 and D2D communication of devices such as the second device 122 and the third device 123. The scheduler determines whether there is the possibility of communicating in direct D2D communication, which device may communicate in direct D2D communication, and when the device may communicate in direct D2D communication. The scheduler may provide a discovery signal used to determine their proximity and / or D2D link estimates between the two devices. The scheduler may further allocate resources for the D2D discovery signal and / or the D2D data channel, and / or the D2D control channel. The scheduler may relay information between at least two devices and connection parameters for at least two devices of the D2D link (eg, power settings such as actual, minimum, maximum coding scheme and modulation scheme, Configure transport block size for encryption / integrity protection, segmentation settings such as parameters and / or security keys, protocol parameters, and which radio access technology, spectrum / carrier to use for D2D link) It can.

Typically, a scheduler may be deployed with network node 110. The network node co-located with the scheduler is, in some embodiments, a base station, a stationary relay node (not shown), a mobile relay node (not shown), a first device 121, a second device 122, a third It may be a wireless device other than the device 123 or the first device 121, the second device 122, and the third device 123. The scheduler may be able to communicate with devices such as the first device 121, the second device 122 and the third device 123 via respective scheduler links. The scheduler may also communicate with other devices via other D2D controller links.

  The embodiments herein for processing D2D communication, such as the processing circuitry 1609 of the network node 110 shown in FIG. 16, together with computer program code for performing the functions and operations of the embodiments herein. , May be implemented by one or more processors. The above program code is further provided, for example, as a computer program product in the form of a data carrier holding computer program code for implementing the embodiments herein when loaded into the network node 110. It is also good. One such carrier may be in the form of a CD ROM disc. However, other data carriers such as a memory stick may also be feasible. In addition, computer program code may be provided as pure program code on a server and downloaded to network node 110.

  Network node 110 may further comprise a memory circuit 1610 that includes one or more memory units. The memory circuit 1610 may be any information received or measured by the processing circuit 1609 in connection with the acquisition of device location and / or interference, and for performing the methods herein when implemented in the network node 110. It may be configured to be used to store data, such as an application. Memory circuit 1610 may be in communication with processing circuit 1609. Any of the other information processed by processing circuitry 1609 may be further stored in memory circuitry 1610.

  In some embodiments, information regarding the location of the device may be received from other mechanisms in mixed wireless network 100 through receive port 1611. In some embodiments, the receive port 1611 may be connected to a positioning sensor such as, for example, GPS. In another embodiment, the receiving port 1611 may be a network based positioning service via a corresponding communication protocol. The receive port 1611 may communicate device location information to the processing circuitry 1609 as it may communicate with the processing circuitry 1609. The receive port 1611 may be configured to receive other information. In some embodiments, information regarding device interference may be received from other mechanisms in mixed wireless network 100 through receive port 1611. The receive port 1611 may communicate device interference information to the processing circuit 1609 as it may communicate with the processing circuit 1609.

  The information received or measured by the processing circuit 1609 in relation to the location of the device and / or the acquisition of interference of the devices 122, 123 is stored in the memory circuit 1610 which may be in communication with the processing circuit 1609 and the receiving port 1611 as described above. It can be done.

  Processing circuitry 1609 may be further configured to transmit information such as transmission grants through transmission port 1612, which may be in communication with processing circuitry 1609 and memory circuitry 1610.

  The multiplexing circuit 1601, setting circuit 1602, acquisition circuit 1603, scheduling circuit 1604, positioning circuit 1605, allocation circuit 1606, adaptive circuit 1607, and determination circuit 1608 described above are a combination of analog circuits and digital circuits, and / or processing It may indicate one or more processors configured with software and / or firmware (e.g., stored in memory) to be executed as described above when executed by one or more processors, such as circuit 1609. It will be further understood by those skilled in the art. One or more of these processors and other digital hardware may be included in a single application specific integrated circuit (ASIC), or multiple processors and various digital hardware May be distributed among multiple individual components, regardless of whether they are individually packaged or incorporated into a system on chip (SoC).

  Where the term "comprising" is used, it is not to be interpreted as limiting, i.e. to be interpreted as meaning "consisting at least of."

  The embodiments herein are not limited to the preferred embodiments described above. Various alternatives, modifications and equivalents may be used. Accordingly, the embodiments described above should not be construed as limiting the scope of the specification as defined by the appended claims.

Claims (19)

A method at a user equipment (UE) device for wirelessly communicating on a multiplexed physical channel between one or more devices and a network node in a mixed wireless network,
The one or more devices include the UE device, and the mixed wireless network includes a cellular network including one or more cellular channels and a D2D network including one or more device to device (D2D) channels. And the method comprises
Transmitting and receiving a first set of wireless traffic using the one or more cellular channels of the cellular network;
Transmitting and receiving a second set of wireless traffic using the one or more D2D channels of the D2D network;
The physical channels are time division multiplexed between a first group of cellular channels of the one or more cellular channels and a first group of D2D channels of the one or more D2D channels. ,
A second group of cellular channels of the one or more cellular channels, between said first group of D2D channel, the physical channels are frequency division multiplexed, said second group of cellular channels And a frequency margin is set between the and the first group of D2D channels based on information on the interference of one or more active D2D devices ,
A method characterized by The physical channel includes a cellular dedicated subframe and two types of subframes including a D2D and a cellular corresponding subframe, and the cellular dedicated subframe is associated with the first group of cellular channels, the D2 D and the D 2 D and the cellular dedicated subframe. The cellular enabled subframes are associated with the second group of cellular channels and the first group of D2D channels,
A method according to claim 1, characterized in that. The first group of cellular channels includes a first cellular channel pre-scheduled with fixed timing and resource location, and the second group of cellular channels is a second dependent on signaling of other cellular channels. Including the cellular channel of
The method according to claim 1 or 2, characterized in that: The first group of cellular channels includes a cellular physical uplink control channel dedicated scheduling request / channel quality indicator (PUCCH D-SR / CQI) channel, and the second group of cellular channels is PUCCH acknowledgment / not acknowledge. Acknowledgment (PUCCH A / N) channels are included, and said first group of D2D channels comprises D2D control channels (DCCH) and D2D shared channels (DSCH),
A method according to any one of the preceding claims, characterized in that. At least one of the first group of cellular channels and the second group of cellular channels further includes a cellular physical uplink shared channel (PUSCH).
5. A method according to any one of the preceding claims, characterized in that. The first group of cellular channels includes physical uplink control channel acknowledgment / negative acknowledgment (PUCCH A / N) channels.
A method according to any one of the preceding claims, characterized in that. The frequency margin includes seven or more physical resource blocks.
The method of claim 1, wherein the. The one or more devices include one or more cellular devices and one or more D2D devices,
Of the previous SL one or more cellular devices, the D2D and or every cellular device already allocated is allocated to the cellular response within the sub-frame, the cellular device is assigned or already assigned the D2D and cellular corresponding sub in the frame, the information on interference of one or more active D2D device of the one or more D2D device is acquired by the network node,
Method according to claim 6 or 7 , characterized in that. Said information on interference, and measuring the interference, the network node, the information on interference, comprising: receiving from at least one of the one or more D2D devices, it is acquired by one of the The
A method according to claim 8 , characterized in that. If the obtained information about the interference is above the interference threshold, the frequency margin is set,
A method according to claim 8 or 9 , characterized in that. The D2D and cellular enabled subframes have locations for the second group of cellular channels,
Among the previous SL one or more cellular devices, only cellular devices that are transmitted at a power below the first power threshold is scheduled in the position for the second group of cellular channels,
11. A method according to any one of claims 8 to 10 , characterized in that. Wherein a physical within the channel, and the cellular-only sub-frame and the D2D and cellular corresponding subframe is repeatedly positioned,
A method according to claim 2, characterized in that. Within the physical channel, the cellular dedicated subframes and the D2D and cellular enabled subframes are repeatedly located using a timing pattern based on the hybrid automatic repeat request (HARQ) timing of the cellular network,
A method according to claim 12 , characterized in that. Of the cellular dedicated subframes and the D2D and cellular enabled subframes, such that all subframes corresponding to the same HARQ process are either cellular dedicated subframes or D2D and cellular enabled subframes. against only one, a plurality of sub-frames of the same HARQ process is allocated together,
The method according to claim 13 , characterized in that. In the time division multiplexing and the frequency division multiplexing, the cellular dedicated subframe, the D2D and the cellular based on the amount of resources required by cellular signaling and the amount of resources required by D2D signaling. the method of claim 2, wherein the ratio of the corresponding sub-frame is allowed to dynamically adapt. Based on the acquired information on interference such that the acquired information on interference falls within the determined interference threshold, in the D2D and cellular corresponding subframes of the cellular channel and the D2D channel interval frequency or time is dynamically determined,
A method according to any one of claims 8 to 11 , characterized in that. The network node is one of a base station, a stationary relay node, and a mobile relay node.
The method according to any one of claims 1 to 16, characterized in that. A user equipment (UE) device for wireless communication on physical channels multiplexed between one or more devices and a network node in a mixed wireless network,
The one or more devices include the UE device, and the mixed wireless network includes a cellular network including one or more cellular channels and a D2D network including one or more device to device (D2D) channels. The UE device comprises
A processing unit,
A wireless transceiver unit,
Transmit and receive wireless traffic using the one or more cellular channels of the cellular network;
Transmit and receive wireless traffic using the one or more D2D channels of the D2D network,
The wireless transmission / reception unit;
The physical channels are time division multiplexed between a first group of cellular channels of the one or more cellular channels and a first group of D2D channels of the one or more D2D channels. ,
A second group of cellular channels of the one or more cellular channels, between said first group of D2D channel, the physical channels are frequency division multiplexed, said second group of cellular channels And a frequency margin is set between the and the first group of D2D channels based on information on the interference of one or more active D2D devices ,
A UE device characterized by The first group of cellular channels includes a cellular physical uplink control channel dedicated scheduling request / channel quality indicator (PUCCH D-SR / CQI) channel,
The second group of cellular channels includes PUCCH Acknowledgement / Non-acknowledgement (PUCCH A / N) channels,
The first group of D2D channels includes a D2D control channel (DCCH) and a D2D shared channel (DSCH),
The UE device according to claim 18 , characterized in that.