Enhancing uplink measurements for positioning by adaptively using multi-antenna systems
Techniques and devices for improving uplink positioning techniques are described. An example method, implemented in a first node in a wireless communications network, begins with obtaining multi-antenna configuration information or multi-antenna capability data, or both, for a second node in the wireless communications network. The node carrying out the node may be a radio base station, a measuring node, or a wireless device to be positioned, in various embodiments. In some embodiments, the second node is a measuring node. In others, the second node is the wireless device to be positioned. The method continues with adapting a multi-antenna configuration of the wireless device for one or more transmissions to be measured for positioning purposes, or adapting a multi-antenna configuration of the measuring node for one or more positioning measurements, or both. The adapting is based on the obtained multi-antenna configuration information or multi-antenna capability data, or both.
1. A method, in a first node in a wireless communications network, for assisting positioning measurements, wherein the method comprises:
obtaining a multi-antenna configuration information or a multi-antenna capability data, or both, for a second node in the wireless communications network; and
adapting, by the first node, a multi-antenna configuration of the first node for one or more transmissions to be measured for positioning purposes based on the obtained multi-antenna configuration information or multi-antenna capability data, or both,
wherein adapting the multi-antenna configuration of the wireless device comprises selecting at least one of a multi-antenna technique and a transmit antenna configuration, at a measuring node, and
measuring the one or more transmissions for positioning purposes using the selected at least one of a multi-antenna technique and a transmit antenna configuration.
2. The method of claim 1 , wherein the multi-antenna capability data indicates at least one of: a capability of using a particular multi-antenna configuration; a capability of dynamically activating or deactivating one or more antennas; a capability of determining a multi-antenna configuration; and a capability of adapting the multi-antenna configuration.
3. The method of claim 1 , further comprising performing at least one radio signal transmission or at least one radio measurement, based on the adapted multi-antenna configuration.
4. The method of claim 1 , wherein adapting the multi-antenna configuration comprises adapting the transmit antenna configuration by adapting at least one of:
a transmit antenna type;
an antenna pattern;
a number of transmit antennas or transmit antenna ports;
a set of transmit antennas to be used;
an antenna spacing;
an antenna polarization;
one or more antenna orientation parameters;
a transmitter beam configuration;
a transmission power or power weights associated with transmit antennas, transmit antenna elements, or multi-antenna branches or streams;
a number of streams transmitted by multiple antennas;
a reference signal specific to multi-antenna transmission; and
information specifying a carrier, a number of carriers, a frequency band, or a system combination, or a combination thereof, for the multi-antenna transmission.
5. The method of claim 4 , wherein adapting the transmit antenna configuration comprises adapting at least one of:
a maximum absolute power or a maximum relative transmit power allowed per transmit antenna, an antenna element, or a branch;
a transmit power back for a multi-antenna transmitter or a multi-antenna scheme; and
a transport form of a multi-antenna signal.
6. The method of claim 1 , wherein adapting the multi-antenna configuration comprises adapting the transmit antenna configuration based on at least one of:
a transmit antenna type;
an antenna pattern;
a number of transmit antennas or transmit antenna ports;
a set of transmit antennas to be used;
an antenna spacing;
an antenna polarization;
one or more antenna orientation parameters;
a transmitter beam configuration;
a transmission power or power weights associated with transmit antennas, transmit antenna elements, or multi-antenna branches or streams;
a number of streams transmitted by multiple antennas;
a reference signal specific to multi-antenna transmission; and
information specifying a carrier, a number of carriers, a frequency band, or a system combination, or a combination thereof, for the multi-antenna transmission.
7. The method of claim 1 , wherein adapting the multi-antenna configuration comprises adapting a receive antenna configuration by adapting at least one of:
a receive antenna type;
a receiver type for receiving a multi-antenna transmission;
an antenna pattern;
a number of receive antennas, receive antenna ports, branches, or streams;
a set of receive antennas to be used for receiving transmissions to be measured;
a receive antenna spacing;
a receive antenna polarization;
one or more receive antenna orientation parameters;
a receiver beam configuration;
weights associated with receive antennas, receive antenna elements, branches, or streams;
a number of transmitted streams to be received; and
information specifying a carrier, a number of carriers, a frequency band, or a system combination, or a combination thereof, for the multi-antenna transmission.
8. The method of claim 7 , wherein adapting the receive antenna configuration comprises selecting a transport format for a multi-antenna signal to be received.
9. The method of claim 1 , wherein adapting the multi-antenna configuration comprises adapting a receive antenna configuration based on at least one of:
a receive antenna type;
a receiver type for receiving a multi-antenna transmission;
an antenna pattern;
a number of receive antennas, receive antenna ports, branches, or streams;
a set of receive antennas to be used for receiving transmissions to be measured;
a receive antenna spacing;
a receive antenna polarization;
one or more receive antenna orientation parameters;
a receiver beam configuration;
weights associated with receive antennas, receive antenna elements, branches, or streams;
a number of transmitted streams to be received; and
information specifying a carrier, a number of carriers, a frequency band, or a system combination, or a combination thereof, for the multi-antenna transmission.
10. The method of claim 1 , wherein obtaining the multi-antenna capability data comprises receiving data describing the capabilities from another node in the wireless communications network.
11. The method of claim 1 , wherein the adapting is performed by the first node based on a pre-defined rule, autonomously, or based on a request, indication or instruction received from another node.
12. The method of claim 1 , wherein the adapting is further based on one or more of:
interference conditions;
bandwidth configurations or transmit signal configurations;
feedback availability;
measurement performance;
UE speed;
environment type;
a type or types of signals used for positioning measurements;
whether carrier aggregation is used by the wireless device;
multi-antenna related capability of another node, and
a duplex mode configuration for the wireless device or a measuring node.
13. A first node in a wireless communication system, the first node comprising a network interface circuit adapted for communication with one or more other nodes in the wireless communication system and a processing circuit, wherein the processing circuit is adapted to:
obtain a multi-antenna configuration information or a multi-antenna capability data, or both, for a second node in the wireless communications network; and
adapt a multi-antenna configuration of the first node for one or more transmissions to be measured for positioning purposes based on the obtained multi-antenna configuration information or multi-antenna capability data, or both, wherein the processing circuit is adapted to the multi-antenna configuration of the wireless device by selecting at least one of a multi-antenna technique and a transmit antenna configuration, at a measuring node, and measuring the one or more transmissions for positioning purposes using the selected at least one of a multi-antenna technique and a transmit antenna configuration.