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AssigneeNokia Solutions and Networks Oy
InventorsHonglin Hu, Haifeng Wang, Ping Zhou
Estimating the term…
An apparatus such as a user equipment is in an embodiment of the invention configured to broadcast an access request to at least one neighboring node, the access request containing signature information indicating a user identifier, to check whether a collision indicator is received from a relay node, and to send another access request depending on a received collision indicator. The collision indicator may e.g. be a signature collision indicator, received from the node in case of colliding users, or a collision indicator of transmission received when transmissions of access requests are colliding at the node. A relay node may be configured to receive an access request from a user equipment, to detect a collision, and to inform the user equipment on a detected collision, indicating a type of collision.
An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code being configured, with the at least one processor, to cause the apparatus to perform at least the following:
An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code being configured, with the at least one processor, to cause the apparatus to perform at least the following:
A method comprising:
A method, comprising:
A computer program product embodied on a non-transitory computer-readable medium, in which a computer program is stored, that, when being executed by a computer, is configured to provide instructions for carrying out at least the following:
Dependencies are inferred from the claim text.
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Random access procedures, e.g. with 4-step access: with collision treatment
Automatic repetition systems, e.g. Van Duuren systems: arrangements specially adapted for the transmitter end
Terminal devices: adapted for relaying to or from another terminal or user
Wireless communication networks
About 1 year 10 months of term left · ends 28 Aug 2028 (estimated)
Current or future wireless networks, such as beyond 3G mobile radio system, may require considerably large coverage areas and high data rate. A relay network may be employed for current and future demands. Incorporating fixed or mobile relays in the network may e.g. be a modification in the wireless network architecture to meet desired high throughput and coverage requirements for actual or future application. In relay networks, a relay node, RN, is provided which forwards data or signalling from a source node, SN, to a destination node, DN, which is out of reach of the SN.
Random access protocols are widely used in a cellular network for initial access, bandwidth request, location update, etc. However, random access schemes may have problems regarding user collision which reduces the throughput. Moreover, the collision may also result in an uncontrollable access delay which makes it difficult to meet quality of service, QoS, requirement for an attempted user.
In a cooperative network, user collision may become problematic when a random access is relayed to a base station, BS, because the collision consumes not only resources of the random access channel in the system but also causes high overhead of the link establishment between the source user and the relay node during the initial random access. Furthermore, the access delay may become uncontrollable if the user needs to re-establish the communication with the relay node before retransmission. Therefore, it is desirable to reduce user collision in the relaying network and the number of unnecessary retransmission for the random access should also be minimized.
FIG. 1 illustrates an embodiment of a system and apparatuses in accordance with the invention, illustrating a random access in a relay based network;
FIG. 2 shows an embodiment of a frame structure for peer-to-peer transmission configured in accordance with an implementation of the invention;
FIG. 3 illustrates a flow chart of a handshake procedure at a user equipment requesting access, according to another embodiment of the invention;
FIG. 1 illustrates an embodiment of a system, method and apparatuses in accordance with one, more or all of the embodiments of the invention, illustrating a random access in a network such as a relay based network. In the embodiment of FIG. 1, a user equipment 2, UE3, directly sends an access request to a base station 1 of a mobile cellular network comprising one or more cells 3 defined by one or more base stations 1. A device or apparatus 4, e.g. a user equipment, acts as a relay node RN1 to help a user equipment 5, UE1, to access the network or base station.
A device or apparatus 6, e.g. a user equipment, acts as a relay node RN2 to help a user equipment 7, UE2, to access the network or base station.
During random access, an attempted user, that is a user requesting the access, transmits both a preamble and a message. Usually, the preamble is randomly selected indicating information of user signature that denotes a user identifier. The message may contain user specific information, such as bandwidth request, priority, location update, etc. In accordance with one, more or all of the embodiments of the invention, the message transmission can be either separated from or along with the preamble transmission. Embodiments of the invention can be applied to the transmission of the preamble, or to the transmission of the message, or to both of the transmissions of the preamble and the message.