Common search space for machine type communications
AssigneeQUALCOMM Incorporated
InventorsAlberto RICO ALVARINO, Wanshi CHEN, Hao XU
Life of this patent
Estimating the term…
Abstract
Certain aspects of the present disclosure generally relate to wireless communications and more specifically to search space configuration in systems utilizing devices with limited communications resources, such as machine type communication (MTC) devices and enhanced MTC (eMTC) devices. An example method generally includes receiving a physical random access channel (PRACH) signal from a first user equipment (UE) on a first narrowband region within a wider system bandwidth and transmitting, in response to the PRACH signal, a random access response (RAR) signal in a first search space in a second narrowband region in at least a first subframe.
Claims27
A method for wireless communications performed by a base station (BS), comprising:
- receiving a physical random access channel (PRACH) signal from a first user equipment (UE) on a first narrowband region within a wider system bandwidth;
- and
- transmitting, in response to the PRACH signal, a random access response (RAR) message in a first search space in a second narrowband region in at least a first subframe.
A method for wireless communications performed by a base station (BS), comprising:
- scrambling a first demodulation reference signal (DM-RS) to a first UE with a first scrambling sequence initialized with a scrambling sequence initialization;
- scrambling a second DM-RS to a second UE with a second scrambling sequence initialized with the scrambling sequence initialization;
- and
- transmitting the scrambled first DM-RS to the first UE and the scrambled second DM-RS to the second UE in a same search space.
A method for wireless communications performed by a user equipment (UE), comprising:
- transmitting a physical random access channel (PRACH) signal to a base station (BS) on a first narrowband region within a wider system bandwidth;
- and
- receiving, in response to the PRACH signal, a random access response (RAR) message in a first search space in a second narrowband region in at least a first subframe.
A method for wireless communications performed by a user equipment (UE), comprising:
- receiving a first demodulation reference signal (DM-RS) scrambled with a first scrambling sequence initialized with a scrambling sequence initialization;
- receiving a signal scrambled with the first scrambling sequence in a search space, wherein at least a second DM-RS scrambled with a second scrambling sequence initialized with the scrambling sequence initialization is transmitted in the search space;
- and
- descrambling the signal with the first scrambling sequence.
27-38. (canceled)
Dependencies are inferred from the claim text.