Abstract:
A method, apparatus and computer program product are provided to facilitate the determination of the timing advances of each of a plurality of component carriers by triggering the determination of the timing advances in response to certain pre-defined events that are indicative of a need for the timing advance to be determined. A method may include determining that a pre-defined event has occurred and triggering a determination of a timing advance for a second component carrier relative to a timing advance of a first component carrier based upon occurrence of the predefined event. In this regard, both the component carriers are concurrently allocated to a mobile terminal. The method may also utilize the timing advance to synchronize communications on the second component carrier between the mobile terminal and a network. A corresponding apparatus and computer program product may also be provided.
Abstract:
A method for providing uplink feedback optimization may include determining a set of candidate uplink subframes and corresponding component carriers to transmit uplink feedback, and determining a selected uplink subframe and corresponding component carrier from among the set of candidate uplink subframes based on a feedback delay associated with the set of candidate uplink subframes. A corresponding apparatus and computer program product are also provided.
Abstract:
A timing advance TA for a second component carrier CC is determined in dependence on a difference value that is indicated in wireless signaling between a network and a user equipment UE, in which the second CC and a first CC is allocated to the UE simultaneously. The determined TA is utilized to synchronize wireless communications on the second CC between the network and the UE. In exemplary embodiments: the difference value is a difference between times at which downlink transmissions were sent on the first and second CCs, and determining comprises solving for the TA for the second CC utilizing the signaled difference value in at least one algorithm; the difference value may be signaled in a MAC message or via RRC signaling, and the second CC may be an extension carrier. Apparatus, methods and programs are detailed for the UE and for the network access node/eNB.
Abstract:
A method includes determining one of a multiplicity of subframes in a resource space in which a shortened subframe is to be communicated. Each of the subframes has a predetermined number of symbol positions. The resource space includes the multiplicity of subframes. The method includes communicating the shortened subframe in the determined subframe. The shortened subframe has a multiplicity of active symbols at first symbol positions in the determined subframe and has a multiplicity of blanked symbols at second symbol positions in the determined subframe. In an embodiment, each of the subframes is a first subframe carried on subcarrier. The resource space corresponds to a special subframe in a frame including the special subframe and a multiplicity of second subframes. The special subframe and the plurality of second subframes are located in different timeslots. Apparatus, computer programs, and program products are also disclosed.
Abstract:
To find a D2D channel, by example a shared channel for offload traffic from an allocated D2D channel, a cellular network access node sends a configuration message with parameters (e.g., sensing time, frequency band, sensing mechanism, cyclic shift) for a D2D device to sense spectrum. From results of this spectrum sensing is decided whether to utilize a frequency band, sensed according to the parameters, for D2D communications. In an embodiment the network selects a subframe configuration to set the sensing time, in which different subframe configurations have different-length guard periods which is the sensing time. In embodiments a first sensing is within a guard period and represents coarse sensing results and if those are not sufficient the network configures a longer sensing time (e.g., spanning multiple subframes) for finer sensing results. The network or alternatively the D2D device decides whether to use the sensed frequency band for offload traffic.
Abstract:
A method, apparatus, computer readable medium is provided to perform resource coordination among multiple cells to cancel near-far interference for device-to-device transmission, including cross-cell device-to-device transmission. In this context, a dedicated resource exchanging channel can be defined between cellular user equipment and device-to-device user equipment for interference control and resource coordination. A cellular user equipment can forward its uplink resource grant information over the dedicated resource exchanging channel when it determines potential interference. A device-to-device user equipment can monitor the dedicated resource exchanging channel in order to identify one or more resources that can potentially interfere with device-to-device transmission.
Abstract:
A method, network server, and communication system for deleting an address of a network anchor point from a network server is disclosed. A MMM sends an instruction to the network server to instruct the network server to delete an address of a network anchor point that has been previously stored in the network from. The network server deletes the address of the network anchor point from the network server.
Abstract:
Methods and apparatus, including computer program products, are provided for allocating resources among user elements. In one aspect there is provided a method. The method may include receiving, at a base station, information from a user element. The information may include at least one bit representing whether direct transmissions between pairs of user elements cause interference to the user element. The base station may schedule, based on the received information, the user element into at least one of a first subframe, when the received information indicates a risk of interference from the direct transmissions between the pairs of user elements, and into a second subframe, when the received information indicates no risk of interference from the direct transmissions between the pairs of user elements. Related apparatus, systems, methods, and articles are also described.
Abstract:
The present application discloses a method, an apparatus and a computer program product for allocating resources for a Device-to-Device (D2D) direct communication user equipment in a wireless communication network, wherein the method comprise: transmitting a communication channel status report regarding Device-to-Device direct communication to a base station; receiving resource allocation instructions generated by the base station based on the communication channel status report; and performing Device-to-Device direct communication between user equipments on the allocated resources; the disclosed apparatus comprises transmitting means for transmitting a communication channel status report regarding Device-to-Device direct communication to a base station; receiving means for receiving resource allocation instructions generated by the base station based on the communication channel status report; and performing means for performing Device-to-Device direct communication between user equipments on the allocated resources. By using the method, apparatus and computer program product disclosed in the present application, resource sharing/allocation collision between the D2D user equipment and cellular user equipment can be effectively reduced and use rate of resources can be improved.
Abstract:
Various methods for managing device-to-device interference are provided. One example method includes receiving an expected interference level for a resource block, where the expected interference level is represented by data indicative of interference associated with the resource block due to device-to-device communications using the resource block. The example method further includes selecting the resource block for a device-to-device communications session based at least in part on the expected interference level for the resource block. Similar and related example methods and example apparatuses are also provided.